CBSE Class 10 Physics Light Reflection and Refraction MCQs

Question : Coin placed in a bowl when seen from a place just disappears. When water is poured into the bowl without disturbing the coin , the coin
(a) Will not be seen
(c) Becomes visible again
(b) Appears above the water surface
(d) Appears very much deep inside the water

 

Question : Choose wrong statement :

(a) Light is invisible energy 

(b) light causes in us sensation of sight

(c) Light may be obtained from heat energy 

(d) We can see light

Answer :  D

 

Question : Transparent medium is one :

(a) Which partially allows light to pass through

(b) Which absorbs most of the light

(c) Which allows most of the light to pass through

(d) None of these

Answer :  C

 

Question : Speed of light is maximum in :

(a) Air 

(b) Water 

(c) Glass 

(d) Vacuum

Answer :  D

 

Question : Which of the following is not a natural source of light :

(a) Sun 

(b) Oil-lamps 

(c) Moon 

(d) Stars

Answer :  C

 

Question : Light is :

(a) Transverse wave 

(b) Longitudinal wave

(c) Mechanical wave 

(d) Both (b) and (c) are correct

Answer :  A

 

Question : Example of transparent medium is :

(a) Air 

(b) Distill water 

(c) Glass 

(d) All are correct

Answer :  D

 

Question : Straight line path along which light travels in a given direction is :

(a) Ray 

(b) Line segment 

(c) Beam 

(d) None of these

Answer :  A

 

Question : Thick layer of water is :

(a) Transparent 

(b) Translucent 

(c) Opaque 

(d) None of these

Answer :  B

 

Question :In a plane mirror, which layer acts as the reflecting layer :

(a) Glass sheet 

(b) Silver layer

(c) Orange red paint layer 

(d) Both (a) and (b) are correct

Answer :  B

 

Question : Normal always lies between the incident ray and the reflected ray when the ray is incident obliquely on a surface. State true or false :

(a) True 

(b) False

(c) Cannot be determined 

(d) None of these

Answer :  A

 

Question : A thin plane mirror :

(a) Reflects light 

(b) Refracts light 

(c) Transmits light 

(d) None of these

Answer :  A

 

Question : A real image is formed when two or more :

(a) Reflected rays meet 

(b) Refracted rays meet

(c) Reflected rays appear to meet 

(d) Both A and B are correct

Answer :  D

 

Question : State true or false :-

(i) Laws of reflection are valid only for plane surfaces

(ii) A ray of light retraces its path after reflection in case of normal incidence

(iii) Glance angle of incidence is always equal to angle of reflection.

(a) TTT 

(b) FTF 

(c) FTT 

(d) FFT

Answer :  C

 

Question : We can see the things around us due to :

(a) Regular reflection 

(b) Irregular reflection 

(c) Specular reflection 

(d) Mixed reflection

Answer :  B

 

Question : The focal length of a spherical mirror whose radius of curvature is 20 cm is :

(a) 40 cm 

(b) 30 cm 

(c) 20 cm 

(d) 10 cm

Answer :  D

 

Question : The focal length of a plane mirror is :

(a) zero 

(b) 10 cm 

(c) 20 m 

(d) ∞

Answer :  D

 

Question : Inner side of a spoon is an example of :

(a) Concave lens 

(b) Concave mirror 

(c) Convex mirror 

(d) Convex lens

Answer :  B

 

Question : A ray of light is incident on a plane mirror at an angle of incidence i. Then the ray after reflection is deviated by an angle q equal to :

(a) i 

(b) π – i 

(c) 2i 

(d) π – 2i

Answer :  D

 

Question : Plane mirror is used in :

(a) Galvanometer Scale 

(b) Microscope 

(c) Telescope 

(d) None of these

Answer :  A

 

Question :A ray of light coming along radius of curvature after reflection from concave mirror :

(a) passes through focus 

(b) passes through centre of curvature

(c) passes through F/2 

(d) can go in any direction

Answer :  B

 

Question : When image and object are on the same side of a concave mirror then nature of image will be :

(a) real 

(b) virtual

(c) may be real may be virtual 

(d) nothing can be said

Answer :  A

 

Question : Which mirror cannot form a magnified image?

(a) Convex mirror 

(b) Plane mirror

(c) Both convex and concave mirrors 

(d) Both (a) and (b) are correct

Answer :  D

 

Question : The angle of incidence of a ray passing through centre of curvature of a spherical mirror is :

(a) 0° 

(b) 90° 

(c) 45° 

(d) 180°

Answer :  A

 

Question : The mirror used by a dental surgeon is :

(a) Plane 

(b) Convex 

(c) Concave 

(d) Any one of the above

Answer :  C

 

Question : When an object is moved from C to F of a concave mirror then its image will move from :

(a) C to F 

(b) C to infinity 

(c) F to C 

(d) C to 2C

Answer :  B

 

Question : As per New Cartesian Sign Convention :

(a) Focal length of concave mirror is positive and that of convex mirror is negative

(b) Focal length of both, convex and concave mirror is positive

(c) Focal length of both, convex and concave mirror is negative

(d) Focal length of concave mirror is negative and that of convex mirror is positive

Answer :  D

 

 

Question : Lateral shift varies inversely to :

(a) wavelength 

(b) refractive index 

(c) incident angle 

(d) none of these

Answer :  A

 

Question : The velocity of light in air and glass is 3 ×108 m/s and 2 ×108 m/s respectively. What is the R.I. of glass w.r.t. air:

(a) 1.3 

(b) 1.4 

(c) 1.5 

(d) 6

Answer :  C

 

Question : A virtual image is smaller than the object can be formed by :

(a) convex lens 

(b) concave lens 

(c) concave mirror 

(d) plane mirror

Answer :  B

 

Question : We put glass piece on a printed page, image of prints on the page has same size when viewed from glass piece. The piece is :

(a) convex lens 

(b) glass slab 

(c) concave lens 

(d) prism

Answer :  B

 

Question : In above question if the print image is enlarged then the piece is a :

(a) glass slab 

(b) convex lens 

(c) concave lens 

(d) prism

Answer :  B

Question. Four students A, B, C and D carried out the experiment of finding out focal length

 Answer: A

Question. When a ray of light passes from a denser medium to a rarer medium which angle is greater
a) angle of incidence 
b) angle of refraction
c) both
d) none

Answer: B

Question : If parallel rays are incident on a convex lens, after refraction these rays will meet at :

(a) focus 

(b) centre of curvature 

(c) focal plane 

(d) none of these

 Answer :  C

 

Question : If image formed by a lens is always diminished and between F and O then the lens is :

(a) concave 

(b) convex 

(c) both A and B 

(d) none of these

Answer :  A

 

Answer : D

 

Question : Image formed by plane mirror is
(a) real and erect
(b) real an inverted
(c) virtual and erect
(d) virtual and inverted

Answer :  C

Question : Power of a lens is –40, its focal length is
(a) 4 m
(b) – 40 cm
(c) – 0.25 m
(d) – 25 m.

Answer : C

Question : The mirror that always gives virtual and erect image of the object but image of smaller size than the size of the object is
(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) none of these

Answer :  C

Question : The radius of curvature and focal length of a concave mirror are
(a) positive
(b) negative
(c) both
(d) none of these

Answer :  B

Question : The ratio of the speed of light in vacuum to that in a medium is known as
(a) magnification
(b) refraction
(c) refractive index
(d) Snell’s law

Answer :  C

Question : The optical phenomena, twinkling of stars, is due to
(a) atmospheric reflection
(b) total reflection
(c) atmospheric refraction
(d) total refraction

Answer :  C

Question : The unit of power of lens is
(a) metre
(b) centimeter
(c) diopter
(d) m^–1

Answer :  C

Question : The refractive indices of some media are given below:


In which of these is the speed of light minimum and maximum, respectively.
(a) X-minimum, W-maximum
(b) Z-minimum, W-maximum
(c) W-minimum, X-maximum
(d) X-minimum, Z-maximum

Answer :  C

Question : An incident ray makes 60° angle with the surface of the plane mirror, the angle of its refraction is
(a) 60°
(b) 90°
(c) 30°
(d) 0°

Answer :  C

Question : A mirror that has very wide field view is
(a) concave
(b) convex
(c) plane
(d) none of these

Answer :  B

 

Question : Consider The Following Statements And Choose The Correct One:
(a) The phenomenon of lateral inversion is due to the reflection of light.
(b) In the plane mirror, the right side of our body becomes left side in the image, whereas the left side of our body becomes right side in the image.
(c) The nature of image formed by a plane mirror is virtual and erect and the size of image formed by a plane mirror is equal to that of the object.
(d) All the above.

Answer :  D

Question : Sin C =
(a) n/1
(b) 1/n
(c) n2
(d) n/2

Answer :  B

Question : When a ray of light is incident normally, the angle of incidence is
(a) 900
(b) 0
(c) 450
(d) none

Answer :  B

Question : A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is
(a) – 30 cm
(b) – 20 cm
(c) – 40 cm
(d) – 60 cm

Answer :  B

Question : What is the relation between focal length (f) and radius of curvature (r) of a curve mirror?
(a) f = 2r
(b) f = r/2
(c) f = r/3
(d) f = 3r/2

Answer :  A

Question : A stick in water appears broken due to
(a) reflection of light
(b) refraction of light
(c) total internal reflection
(d) none of these

Answer :  B

Question : If angle of incidence is 00 then angle of reflection is
(a) 900
(b) 00
(c)450
(d)600

Answer :  B

Question : Magnification produced by a rear view mirror fitted in vehicles
(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one depending upon the position of the object in front of it.

Answer :  A

Question : In which of the following, the image of an object placed at infinity will be highly diminished and point sized?
(a) Concave mirror only
(b) Convex mirror only
(c) Convex lens only
(d) Concave mirror, convex mirror, concave lens and convex lens

Answer :  D

Question : A point source of light is placed at the centre of curvature of a concave mirror. The angle of deviation of the rays incident on the mirror from this source and reflected from it is
(a) 0
(b) 180 degrees
(c) 90 degrees
(d) 360 degrees

Answer :  B

Question : Rays From Sun Converge At A Point 15 Cm In Front Of A Concave Mirror. Where Should An Object Be Placed So That Size Of Its Image Is Equal To The Size Of The Object?
(a) 15 cm in front of the mirror
(b) 30 cm in front of the mirror
(c) Between 15 cm and 30 cm in front of the mirror
(d) More than 30 cm in front of the mirror

Answer :  B

Question : The refractive index of water is 1.33. The speed of light in water will be
(a) 1.33 × 10⁸ m/s
(b) 3 × 10⁸ m/s
(c) 2.26 × 10⁸ m/s
(d) 2.66 × 10⁸ m/s

Answer :  C

Question : A full length image of a distant tall building can definitely be seen by using
(a) a concave mirror
(b) a convex mirror
(c) a plane mirror
(d) both concave as well as plane mirror

Answer :  B

Question : In A Quiz Competition, You Are Asked A Question Where You Have To Choose The Statement Which Is/ Are Incorrect?
(a) The bending of light when it goes from one medium to another obliquely is called refraction of light.
(b) The refraction of light take place at the boundary between the two media.
(c) The speed of light in air is 3 x 10 to power 18 m/s whereas that in glass is 2 x 10 to power 8 m/s.
(d) Greater the difference in the speed of light in the two media, greater will be the amount of refraction or bending of light.

Answer :  C

Question. Two plane mirrors are inclined at an angle θ. A ray of light is incident on one mirror and is then reflected from the other mirror. Then the angle between the first ray and the final ray will be     
(a) θ
(b) 2θ
(c) between θ and 2θ
(d) > 2θ

Answer : B

Question. A glass slab is placed in the path of a beam of convergent light, then the point of convergence of light   
(a) moves towards the glass slab
(b) moves away from the glass slab
(c) remains at the same point
(d) undergoes a lateral shift

Answer : B

Question. A real image is formed by a convex mirror when the object is placed at   
(a) infinite
(b) between center of curvature and focus
(c) between focus and pole
(d) None of the above

Answer : D

Question. A virtual image is formed by a concave mirror when the object is placed between    
(a) infinity and center of curvature
(b) center of curvature and focus
(c) focus and the pole
(d) All of the above

Answer : C

Question. Find out the correct option from the following.    
(A) The magnification is positive for all virtual images and is negative for all real images.
(B) The magnification of concave lens and convex mirror is always positive where as the magnification of convex lens and concave mirror can be positive or negative depending on the position of the object before the lens.
(a) Only A is true
(b) Only B is true.
(c) Both A and B are true
(d) Both A and B are false

Answer : C

Question. In an experiment to determine the focal length of a concave lens, a student obtained the image of a distant window on the screen. To determine the focal length of the lens, she/he should measure the distance between the    
(a) lens and the screen only
(b) lens and the window only
(c) screen and the window only
(d) screen and the lens and also between the screen and the window

Answer : A

Question. A concave mirror for face viewing has focal length of 0.4 m. The distance at which you hold the mirror from your face in order to see your image upright with a magnification of 5 is:  
(a) 0.24 m
(b) 1.60 m
(c) 0.32 m
(d) 0.16 m

Answer : C

Question. On the basis of experiment ‘to trace the path of a ray of light passing through a rectangular glass slab’ four students arrived at the following interpretations :  
I. Angle of incidence is greater than the angle of emergence.
II. Angle of emergence is less than the angle of refraction.
III. Emergent ray is parallel to the incident ray.
IV. Emergent ray is parallel to the refracted ray.
The correct interpretation is that of the student.
(a) I
(b) II
(c) III
(d) IV

Answer : C

Question. The focal length of a plane mirror is   
(a) positive
(b) negative
(c) zero
(d) infinity

Answer : D

Question. Which of the following statements is true?    
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
(b) A convex lens has –4 dioptre power having a focal length 0.25 m
(c) A concave lens has 4 dipotre power having a focal length 0.25 m
(d) A concave lens has – 4 dioptre power having a focal length 0.25 m

Answer : A

Question. A convex mirror is used   
(a) by a dentist
(b) for shaving
(c) as a rear view mirror in vehicles
(d) as a light reflector for obtaining a parallel beam of light.

Answer : C

Question. In case of a concave mirror, when the object is situated at the principal focus, the image formed is    
(a) real and inverted
(b) of infinite size
(c) lies at infinity
(d) All of these

Answer : D

Question. Virtual images of object of the same size are formed by  
(a) a concave mirror
(b) a convex mirror
(c) a plane mirror
(d) all the above

Answer : C

Question. A person standing at some distance from a mirror finds his image erect, virtual and of the same size. Then the mirror is possibly     
(a) plane mirror
(b) concave mirror
(c) plane or concave mirror
(d) plane or concave or convex mirror

Answer : A

Question. The concave mirrors are used in    
(a) reflecting telescopes
(b) magic- lanterns
(c) cinema projectors
(d) All of these

Answer : D

Question. Which of the following are used in a Kaleidoscope    
(a) plane mirrors
(b) concave
(c) convex mirrors
(d) All of the above

Answer : A

Question. When a convex lens made up of glass is immersed in water, its focal length    
(a) decreases
(b) does not change
(c) increases
(d) None of the above

Answer : C

Question. A 10 mm long awlpin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is  
(a) – 30 cm
(b) – 20 cm
(c) – 40 cm
(d) – 60 cm

Answer : B

Question. The linear magnification for a mirror is the ratio of the size of the image to the size of the object, and is denoted by m. Then, m is equal to (symbols have their usual meanings):  
(a) f/ f - u
(b) f - u/f
(c) f/ f + v
(d) f + v/f

Answer : A

Question. An inverted image can be seen in a convex mirror,    
(a) under no circumstances
(b) when the object is very far from the mirror
(c) when the object is at a distance equal to the radius of curvature of the mirror
(d) when the distance of the object from the mirror is equal to the focal length of the mirror

Answer : A

Question. When an objects is placed between two mirrors placed inclined to each at an angle 45° Number of images formed are     
(a) 3
(b) 5
(c) 7
(d) None of these

Answer : C

Question. Two plane inclined mirrors form 5 images by multiple reflection. The angle of inclination is  
(a) 90°
(b) 60°
(c) 45°
(d) 30°

Answer : B

Question. For an object at infinity, a concave mirror produces an image at its focus which is    
(a) enlarged
(b) virtual
(c) erect
(d) real and point sized

Answer : D

Question. Foam of soap always appears white as   
(a) it contains large hydrocarbon chains.
(b) it absorbs red portion of the visible light
(c) it reflects light of all wavelengths.
(d) it has one hydrophobic end, which is insoluble in water.

Answer : C

Question. A bright × (cross) mark is made on a sheet of white paper. Over the white paper a rectangular glass-slab of thickness 3 cm is placed. On looking through, the image of the mark appears above the mark. It is below the upper surface of the slab by (μglass = 1.5)  
(a) 2.5 cm
(b) 1.5 cm
(c) 2 cm
(d) 1.75 cm

Answer : C

Question. When viewed vertically a fish appears to be 4 meter below the surface of the lake. If the index of refraction of water is 1.33, then the true depth of the fish is  
(a) 5.32 metres
(b) 3.32 metres
(c) 4.32 metres
(d) 6.32 metres

Answer : A

Question. A diverging lens with magnitude of focal length 25 cm is placed at a distance of 15 cm from a converging lens of magnitude of focal length 20 cm. A beam of parallel light falls on the diverging lens. The final image formed is :   
(a) real and at a distance of 40 cm from the divergent lens
(b) real and at a distance of 6 cm from the convergent lens
(c) real and at a distance of 40 cm from convergent lens
(d) virtual and at a distance of 40 cm from convergent lens.

Answer : C

Question. The ratio of the sine of angle of incidence to the sine of angle of refraction is called   
(a) refractive index
(b) optical density
(c) relative density
(d) none of these

Answer : A

Question. A convex lens is put 10 cm from a light source and it makes a sharp image on a screen, kept 10 cm from the lens. Now a glass block (refractive index 1.5) of 1.5 cm thickness is placed in contact with the light source. To get the sharp image again, the screen is shifted by a distance d. Then d is:   
(a) 1.1 cm away from the lens
(b) 0
(c) 0.55 cm towards the lens
(d) 0.55 cm away from the lens

Answer : D

Question. In order to get a diminished virtual image, the object can be placed anywhere in front of a     
(a) concave mirror
(b) plane mirror
(c) convex mirror
(d) none of these

Answer : C

Question : If an incident ray passes through the focus, the reflected ray will
(a) pass through the pole
(b) be parallel to the principal axis
(c) retrace its path
(d) pass through the centre of curvature

Answer :  B

Question : In case of refraction, if the angle of incidence and the angle of refraction are 45 degrees and 30 degrees respectively, then the angle of deviation is
(a) 75 o
(b) 15o
(c) 7.5o
(d) 37.5o

Answer :  B

Question : Which of the following statements is true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
(b) A convex lens has –4 dioptre power having a focal length 0.25 m
(c) A concave lens has 4 dioptre power having a focal length 0.25 m
(d) A concave lens has –4 dioptre power having a focal length 0.25 m

Answer :  A

Question : Under which of the following conditions a concave mirror can form an image larger than the actual object?
(a) When the object is kept at a distance equal to its radius of curvature
(b) When object is kept at a distance less than its focal length
(c) When object is placed between the focus and centre of curvature
(d) When object is kept at a distance greater than its radius of curvature

Answer :  C

Question : A concave mirror forms a real and enlarged image of an object if the object is placed at/between
(a) 2F
(b) F
(c) F and C
(d)F and P

Answer :  C

Question : Focal length of a plane mirror is
(a) zero
(b)infinity
(c) double of its aperture
(d)half of its aperture

Answer :  A

Question : Between red and violet, which color has more frequency? 
(a) Red has more frequency than violet
(b) Violet has more frequency than red
(c) Red and violet has the same frequency
(d) Can not say

Answer :  B

Question : An object at a distance of + 15 cm is slowly moved towards the pole of a convex mirror. The image will get
(a) shortened and real
(b) enlarged and real
(c) enlarge and virtual
(d) diminished and virtual

Answer :  D

Question : Pradeep Appeared In Class Test But He Confused To Know The Correct Statement. Would You Help Him To Know That?
(a) According to the first law of refraction of light, the incident ray, the refracted ray and the normal at the point of incidence, all lie in the same plane.
(b) According to Snell’s law of refraction of light, the ratio of sine of angle of incidence to the sine of angle of refraction is constant for a given pair of media.
(c) The refractive index of a medium gives an indication of the light bending ability of that medium.
(d) All the above.

Answer :  D

Question : In case of refraction, when the light passes from rarer to a denser medium, if the angle of incident is 65o and angle of refraction is 25o, then the deviation of angle would be-
(a) 65o
(b) 25o
(c) 40o
(d) 30o

Answer :  C

Question : In torches, search lights and headlights of vehicles the bulb is placed
(a) between the pole and the focus of the reflector
(b) very near to the focus of the reflector
(c) between the focus and centre of curvature of the reflector
(d) at the centre of curvature of the reflector

Answer :  B

Question : An object at a distance of 30 cm from a concave mirror gets its image at the same point. The focal length of the mirror is
(a) – 30 cm
(b) 30 cm
(c) – 15 cm
(d) +15 cm

Answer :  C

Question : To obtain parallel ray from a point light source we use
(a) both convex lens and concave mirror
(b) both convex lens and convex mirror
(c) both concave lens and concave mirror
(d) both concave lens and convex mirror

Answer :  A

Question : A Concave Mirror Produces Magnification Of +4. The Object Is Place(d)
(a) At the focus
(b) Between focus and centre of curvature
(c) Between focus and pole
(d) Beyond the centre of curvature

Answer :  C

Question : Magnification produced by a rear view mirror fitted in vehicles
(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one depending upon the position of the object in front of it

Answer :  A

Question : The refractive index of a medium with respect to vacuum is
(a) Always greater than one
(b) Always less than one
(c) Equal to one
(d) none of the above

Answer :  B

Question : A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.
(a) Plane, convex and concave
(b) Convex, concave and plane
(c) Concave, plane and convex
(d) Convex, plane and concave

Answer :  C

Question : The distance between the object and image will be
(a) 0.25 m
(b) 1.0 m
(c) 0.5 m
(d) 0.125 m

Answer :  C

Question : Magnification produced by a plane mirror is
(a)-1
(b) zero
(c) +1
(d) infinity

Answer :  C

Question : Mirror used for focusing light is
(a) Concave
(b) Convex
(c) plane
(d) none

Answer :  A

Question : What will be the angle of refraction for a ray of light fall perpendicular to the interface of two mediums?
(a) 90o
(b) 0o
(c) 180o
(d) 45o

Answer :  B

Question : Focal length of a convex lens is 15 cm. For which distance an object is placed so that the lens acts as a magnifying glass?
(a) Between 15 cm and 30 cm
(b) Less than 15 cm
(c) Greater than 30 cm
(d) Exactly at 30 cm

Answer :  B

Question : A ray of light strikes the surface of mirror at an angle of 300 with the mirror. The angle of reflection is:
(a) 300
(b) 600
(c) 450
(d) none.

Answer :  B

Question : An object 20cm high is placed at a distance of 100 cm from a plane mirror .The size of the image will be.
(a) 20 cm
(b) 40cm
(c) 10cm
(d) 100cm

Answer :  A

Question : Velocity of light in vacuum is
(a) 3×10⁸ cm/s
(b) 3×10⁸ km/s
(c) 3×10⁸m/s
(d) none of these

Answer :  C

Question : A concave mirror is a part of a sphere of radius 30cm.It’s focal length is
(a) at infinity
(b)10cm
(c)15cm
(d) 60cm

Answer :  C

Question : Focal length of plane mirror is

(a) at infinity
(b) zero
(c) negative
(d) none of these

Answer :  A

Question : A concave mirror gives, real, inverted and same size image if the object is placed
(a) at F
(b) at infinity
(c) at C
(d) beyond C

Answer :  C

Question : A concave mirror gives virtual, erect and enlarged image if the object is placed:
(a) at infinity
(b) between F and C
(c) between P and F
(d) at F.

Answer :  C

Question : All the distances in case of spherical mirror are measured in relation to
(a) object to image
(b) the pole of the mirror
(c) the focus of the mirror
(d) the image to the object.

Answer :  B

Question : The object distance in both concave as well as convex mirror is
(a) negative
(b) positive
(c) zero
(d) none of these

Answer :  A

Question : In optics an object which has higher refractive index is called
(a) optically rarer
(b) optically denser
(c) optical density
(d) refractive index

Answer :  B

Question : Convex lens focus a real, point sized image at focus, the object is placed
(a) at focus
(b) between F and 2f
(c) at infinity
(d) at 2f

Answer :  C

Question : The radius of curvature of a mirror is 20 cm the focal length is
(a) 20 cm
(b) 10 cm
(c) 40 cm
(d) 5 cm

Answer :  B

Question : The power of a lens is + 1.6 D. The nature of lens is
(a) Convex lens
(b) Concave lens
(c) both concave an convex
(d) none of these

Answer :  A

Question : If the object is placed at focus of a concave mirror, the image is formed at
(a) infinity
(b) focus
(c) centre of curvature
(d) between F and O.

Answer :  A