Total Internal Reflection and its Applications NEET Questions

Physics - Optics

Total Internal Reflection and its Applications MCQ Questions


7.
If two media have refractive indices n₁ (denser) and n₂ (rarer), the critical angle at their interface is:
A.
i_c = sin⁻¹(n₁/n₂)
B.
i_c = sin⁻¹(n₂/n₁)
C.
i_c = tan⁻¹(n₁/n₂)
D.
i_c = cos⁻¹(n₂/n₁)
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ANSWER :
B. i_c = sin⁻¹(n₂/n₁)
8.
The critical angle for water (n = 4/3) is approximately:
A.
37.31°
B.
48.75°
C.
41.14°
D.
24.41°
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ANSWER :
B. 48.75°
9.
The critical angle for crown glass (n = 1.52) with respect to air is approximately:
A.
48.75°
B.
41.14°
C.
24.41°
D.
37.31°
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ANSWER :
B. 41.14°
10.
The critical angle for diamond (n = 2.42) is approximately:
A.
48.75°
B.
41.14°
C.
24.41°
D.
60°
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ANSWER :
C. 24.41°
11.
The critical angle for dense flint glass (n = 1.62) is approximately:
A.
48.75°
B.
41.14°
C.
24.41°
D.
37.31°
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ANSWER :
D. 37.31°
12.
If the critical angle for a transparent medium is 30°, the refractive index of the medium is:
A.
1.5
B.
√2
C.
2
D.
√3
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ANSWER :
C. 2