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Calculate critical angle of incidence between two substances with different refractive indices n1 = 1.5 and n2 = 1.46.
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Given :

$n_1$ = 1.5

$n_2$ = 1.46

Formulae :

$\theta_c = sin^{-1} (\frac{n_2}{n_1})$

$\theta_c = sin^{-1} (\frac{1.46}{1.5})$

$\theta_c = {76.74}^o $

$\theta_c$ = 1.339 radians

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