Optics AFCAT Questions

AFCAT Physics

Optics MCQ Questions


1.
The laws of reflection state that the angle of incidence equals the angle of reflection, and that:
A.
The reflected ray bends towards the normal
B.
The incident ray and reflected ray are perpendicular to each other
C.
The incident ray is always parallel to the surface
D.
The incident ray, reflected ray, and normal all lie in the same plane
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ANSWER :
D. The incident ray, reflected ray, and normal all lie in the same plane
2.
If a ray of light strikes a plane mirror at an angle of 30° with the mirror surface, the angle of reflection (measured from the normal) will be:
A.
90°
B.
45°
C.
60°
D.
30°
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ANSWER :
C. 60°
3.
The image formed by a plane mirror is:
A.
Real, inverted, and magnified
B.
Real, erect, and diminished
C.
Virtual, inverted, and same size
D.
Virtual, erect, and laterally inverted
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ANSWER :
D. Virtual, erect, and laterally inverted
4.
The minimum size of a plane mirror required for a person of height H to see his complete image is:
A.
H
B.
H/3
C.
H/2
D.
2H
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ANSWER :
C. H/2
5.
When a ray of light is incident normally on a plane mirror, the angle of reflection is:
A.
90°
B.
180°
C.
45°
D.
0°
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ANSWER :
D. 0°
6.
If two plane mirrors are inclined at an angle of 60°, the number of images of an object placed between them is:
A.
6
B.
3
C.
4
D.
5
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ANSWER :
D. 5