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A ray of light propagates from glass (refractive index $=3 / 2$ ) to water (refractive index $=4 / 3$ ). The value of the critical angle
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The correct answer is:
$\sin ^{-1}(8 / 9)$
$C=\sin ^{-1}\left(\frac{1}{{ }_w \mu_g}\right)=\sin ^{-1}\left(\frac{\mu_w}{\mu_g}\right)=\sin ^{-1}\left(\frac{8}{9}\right)$
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