Refraction of Light at Plane and Spherical Surfaces NEET Questions

Physics - Optics

Refraction of Light at Plane and Spherical Surfaces MCQ Questions


13.
Which of the following is an example of total internal reflection?
A.
Formation of mirage
B.
Twinkling of stars
C.
Scattering of light
D.
Formation of shadows
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ANSWER :
A. Formation of mirage
14.
Total internal reflection occurs when light travels from:

NEET - 2019

A.
A rarer medium to a denser medium
B.
A denser medium to a rarer medium
C.
Any medium to vacuum
D.
Vacuum to any medium
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ANSWER :
B. A denser medium to a rarer medium
15.
A convex lens behaves as a diverging lens when:
A.
The object is at infinity
B.
The lens is in air
C.
The lens is in water
D.
The object is placed at focus
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ANSWER :
C. The lens is in water
16.
What is the power of a concave lens with a focal length of 50 cm?
A.
-2D
B.
+2D
C.
-1D
D.
+1D
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ANSWER :
B. +2D
17.
What happens to the focal length of a lens when it is placed in water?
A.
Increases
B.
Decreases
C.
Remains unchanged
D.
Becomes zero
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ANSWER :
B. Decreases
18.
A convex lens is made of a material with refractive index (n). If the lens is placed in a medium with refractive index greater than (n), the lens will:

NEET - 2020

A.
Still act as a converging lens
B.
Act as a diverging lens
C.
Stop refracting light
D.
Become a plane mirror
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ANSWER :
B. Act as a diverging lens