A ray of light entering from air into a denser medium of refractive index ${4 \over 3}$, as shown in figure. The light ray suffers total internal reflection at the adjacent surface as shown. The maximum value of angle $\theta$ should be equal to :

Question

${\sin ^{ - 1}}{{\sqrt 7 } \over 3}$

${\sin ^{ - 1}}{{\sqrt 5 } \over 4}$

${\sin ^{ - 1}}{{\sqrt 7 } \over 4}$

${\sin ^{ - 1}}{{\sqrt 5 } \over 3}$

Solution

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