Refraction of Light at Plane and Spherical Surfaces NEET Questions

Physics - Optics

Refraction of Light at Plane and Spherical Surfaces MCQ Questions


7.
When light travels from one medium to another, the quantity that does NOT change is:
A.
Speed
B.
Wavelength
C.
Frequency
D.
Direction
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ANSWER :
C. Frequency
8.
The wavelength of light in vacuum is 600 nm. Its wavelength in a medium of refractive index 1.5 is:
A.
900 nm
B.
600 nm
C.
300 nm
D.
400 nm
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ANSWER :
D. 400 nm
9.
The speed of light in a medium of refractive index 1.5 is approximately:
A.
3 × 10⁸ m/s
B.
4.5 × 10⁸ m/s
C.
2 × 10⁸ m/s
D.
1.5 × 10⁸ m/s
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ANSWER :
C. 2 × 10⁸ m/s
10.
The frequency of light of wavelength 500 nm in vacuum is f. When this light enters water (n = 1.33), its frequency becomes:
A.
f/1.33
B.
f²
C.
1.33f
D.
f (unchanged)
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ANSWER :
D. f (unchanged)
11.
An object placed at the bottom of a tank filled with water (n = 4/3) of depth 12 cm appears to be at a depth of:
A.
16 cm
B.
6 cm
C.
9 cm
D.
12 cm
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ANSWER :
C. 9 cm
12.
A coin lies at the bottom of a swimming pool of depth 2 m filled with water (n = 1.33). To an observer looking from above, the coin appears to be at a depth of approximately:
A.
1.50 m
B.
2.00 m
C.
2.66 m
D.
1.33 m
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ANSWER :
A. 1.50 m