Total Internal Reflection and its Applications NEET Questions

Physics - Optics

Total Internal Reflection and its Applications MCQ Questions


13.
Optical fibers work on the principle of:

NEET - 2017

A.
Refraction
B.
Total internal reflection
C.
Diffraction
D.
Interference
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ANSWER :
B. Total internal reflection
14.
When light enters a denser medium from a rarer medium, it:
A.
Bends towards the normal
B.
Bends away from the normal
C.
Passes undeviated
D.
Gets absorbed
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ANSWER :
A. Bends towards the normal
15.
What happens to the angle of refraction when the angle of incidence is greater than the critical angle?
A.
It becomes 90°
B.
It decreases
C.
It becomes zero
D.
It remains constant
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ANSWER :
A. It becomes 90°
16.
A diamond appears so bright because:

NEET - 2018

A.
It has a low refractive index
B.
It absorbs all light
C.
It has a very high refractive index
D.
It emits light
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ANSWER :
C. It has a very high refractive index
17.
Which of the following does NOT use total internal reflection?
A.
Mirror
B.
Binoculars
C.
Optical fiber
D.
Endoscope
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ANSWER :
D. Endoscope
18.
The refractive index of glass is 1.5. What is the approximate critical angle for glass-air interface?
A.
41.8°
B.
45°
C.
39.6°
D.
50°
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ANSWER :
A. 41.8°