Optics CDS Questions

CDS 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.

The phenomenon responsible for the formation of a rainbow is:

A.

Reflection

B.

Refraction, Dispersion and total internal reflection 

C.

Diffraction and interference

D.

Total internal reflection

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ANSWER :

B. Refraction, Dispersion and 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.

A convex lens with a focal length of 10 cm has a power of:

A.

+10 D

B.

+5 D

C.

-10 D

D.

-5 D

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ANSWER :

A. +10 D

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