The speed of light in media 'A' and 'B' are $2.0 \times {10^{10}}$ cm/s and $1.5 \times {10^{10}}$ cm/s respectively. A ray of light enters from the medium B to A at an incident angle '$\theta$'. If the ray suffers total internal reflection, then

Question

$\theta = {\sin ^{ - 1}}\left( {{3 \over 4}} \right)$

$\theta > {\sin ^{ - 1}}\left( {{2 \over 3}} \right)$

$\theta < {\sin ^{ - 1}}\left( {{3 \over 4}} \right)$

$\theta > {\sin ^{ - 1}}\left( {{3 \over 4}} \right)$

Solution

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