If the angle of incidence is twice the angle of refraction in a medium of refractive indexmu then the angle of incidence is

If the angle of incidence is twice the angle of refraction in a medium

1.	If the angle of incidence is twice the angle of refraction in a medium of refractive indexmu then the angle of incidence is
Answer» `cos^-1(mu/2)` `sin^-1 (mu/2)` `2sin^-1 (mu/2)` `2cos^-1 (mu/2)` ANSWER :D