Physics WAEC

The refractive index of a material is 1.5. Calculate the critical angle at the glass-air interface?

A. 19º
B. 21º
C. 39º
D. 42º

Correct Answer: Option D

D. 42º

Explanation

SinC = 1/n=1/1.5 = 0.6667

C = sin‾¹ 0.6667

= 42º

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