If the critical angle for total internal reflection from a medium… - Vidyadip

Question

If the critical angle for total internal reflection from a medium to vacuum is $30^o $, the velocity of light in the medium is

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Answer

(b) $\mu = \frac{1}{{\sin C}} = \frac{1}{{\sin 30}} = 2$

$ \Rightarrow v = \frac{{3 \times {{10}^8}}}{2} = 1.5 \times {10^8}m/s$

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