Light travels in two media $M_{1}$ and $M_{2}$ with speeds $1.5 \times 10^{8} \mathrm{~ms}^{-1}$ and $2.0 \times 10^{8} \mathrm{~ms}^{-1}$ respectively. The critical angle between them is :

Question

$\tan ^{-1}\left(\frac{3}{\sqrt{7}}\right)$

$\tan ^{-1}\left(\frac{2}{3}\right)$

$\cos ^{-1}\left(\frac{3}{4}\right)$

$\sin ^{-1}\left(\frac{2}{3}\right)$

Solution

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