The refractive index of a medium relative to air is 1.8. Calculate to the nearest degree, the critical angle for the medium

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A. 68°
B. 56°
C. 34°
D. 18°

Correct Answer: Option C

C. 34°

Explanation

C = sin‾¹ 1/n = sin‾¹ 1/1.8 =34°

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