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If the refractive index of glass is 1.5, what is the critica...

If the refractive index of glass is 1.5, what is the critical angle at the air-glass interface?

A.

sin^-1 $\frac{1}{2}$

B.

sin^-1 $\frac{2}{3}$

C.

sin^-1 $\frac{3}{4}$

D.

sin^-1 $\frac{8}{9}$

View answer & explanation

Correct answer is B

sin i_c $\frac{1}{n}$ = $\frac{1}{1 - 5}$

i = sin^-1 $\frac{1}{1 - 5}$

= sin^-1 $\frac{10}{15}$

= sin^-1 $\frac{2}{3}$

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