The wavelengths of the given light waves in air and in a medium are $6000 \, \text{\AA}$ and $4000 \, \text{\AA}$ respectively. The critical angle is \dots \dots \dots.

Question

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

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

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

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

Solution

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