Light - Reflection & Refraction

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About this quiz :

Series name : Boostup
Class : 10th
Subject : science { Physics }
Syllabus : Light - Reflection & Refraction
Total questions : 15
Total marks : 15

1 point

(a) ‘l’ keeps on increasing with increase in angle of incidence

(b) ‘l’ keeps on decreasing with increase in angle of incidence

(d) ‘l’ is the maximum for ∠i = 45o and is less than this value for ∠i = 30o and ∠i = 60o.

Clear selection

1 point

(a) A

(b) B

(d) D

Clear selection

Which position of the object will produce a magnified virtual image, if a concave mirror of focal length 15 cm is being used?

1 point

(a) 10 cm

(b) 20 cm

(d) 35 cm

Clear selection

A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of:

1 point

(a) 120

(b) 90

(d) 0

Clear selection

An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is:

1 point

(a) 2 cm

(b) 4 cm

(d) 22 cm

Clear selection

A concave mirror produces a magnification of +4. The object is placed:

1 point

(a) At the focus

(b) Between focus and centre of curvature

(d) Beyond the centre of curvature

Clear selection

Which diagram shows the formation of image correctly?

1 point

(a) A

(b) B

(d) D

Clear selection

A lens of focal length 12 cm forms an erect image, three times the size of the object. The distance between the object and image is:

1 point

(a) 8 cm

(b) 16 cm

(d) 36 cm

Clear selection

The correct way to measure accurate focal length of the mirror is:

1 point

(a) A

(b) B

(d) D

Clear selection

A ray of light is travelling in a direction perpendicular to the boundary of a parallel glass slab. The ray of light:

1 point

(a) Is refracted towards the normal

(b) Is refracted away from the normal

(d) Does not get refracted

Clear selection

If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed at a distance of 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is:

1 point

(a) 20 cm

(b) 18 cm

(d) 5 cm

Clear selection

A ray of light that strikes a plane mirror PQ at an angle of incidence of 30, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is:

1 point

(a) 30

(b) 45

(d) 90

Clear selection

A student traces the path of a ray of light passing through a rectangular slab.

1 point

(a) A

(b) B

(d) D

Clear selection

An object is placed at 100 mm in front of a concave mirror which produces an upright image (erect image). The radius of curvature of the mirror is:

1 point

(a) Less than 100 mm

(b) Between 100 mm and 200 mm

(d) More than 200 mm

Clear selection

Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror A goes on increasing but that in mirror B remains the same:

1 point

(a) Mirror A is concave and mirror B is convex

(b) Mirror A is plane and mirror B is concave

(d) Mirror A is convex and mirror B is concave

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