Optics AFCAT Questions

AFCAT Physics

Optics MCQ Questions


7.
Critical angle occurs when the angle of refraction is:
A.
0°
B.
45°
C.
90°
D.
180°
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ANSWER :
C. 90°
8.
The focal length of a plane mirror is:
A.
Zero
B.
Infinite
C.
Positive
D.
Negative
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ANSWER :
B. Infinite
9.
Which principle is used in optical fibers?
A.
Diffraction
B.
Reflection
C.
Total internal reflection
D.
Refraction
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ANSWER :
C. Total internal reflection
10.
The mirror equation is given by:
A.
1/f = 1/v - 1/u
B.
1/f = 1/u + 1/v
C.
f = v/u
D.
u = v + f
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ANSWER :
B. 1/f = 1/u + 1/v
11.
Critical angle is defined as the angle of incidence when:
A.
Angle of refraction is 90°
B.
Angle of reflection is 90°
C.
Angle of refraction is 0°
D.
Angle of reflection is 0°
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ANSWER :
A. Angle of refraction is 90°
12.
What happens to light as it passes through a prism?
A.
It undergoes dispersion
B.
It travels without deviation
C.
It reflects completely
D.
It bends away from the prism
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ANSWER :
A. It undergoes dispersion