A ray of light is incident at an angle `i` from denser to rare medium. The reflected and the refracted rays are mutually perpendicular. The angle of reflection and the angle of refraction are respectively r and r'. Then the critical angle will be:

Options

A. (a)`sin^(-1)(sin r)`
B. (b)`sin^(-1)(sin r')`
C. (c)`sin^(-1)(tan i)`
D. (d)`tan^(-1)(sin i)`

Answer

C