Consider a light ray travelling in air is incident into a medium of refractive index \(\sqrt{2n}\) The incident angle is twice that of refracting angle. Then, the angle of incidence will be:
1
\( \sin ^{-1}(\sqrt{n}) \)
2
\(\cos ^{-1}\left(\sqrt{\frac{n}{2}}\right)\)
3
\(\sin ^{-1}(\sqrt{2 n})\)
4
\(2 \cos ^{-1}\left(\sqrt{\frac{n}{2}}\right)\)