Problem

Problem

The angle of polarisation for any medium is 60∘60^\circ , what will be critical angle for this: (a) sin⁡−13\sin^{-1} \sqrt{3} (b) tan⁡−13\tan^{-1} \sqrt{3} (c) cos⁡−13\cos^{-1} \sqrt{3} (d) sin⁡−113\sin^{-1} \frac{1}{\sqrt{3}}

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