A ray of light `(R_(1))` is incident on a glass slab at an angle equal to critical angle of glass - air system. The refracted ray `(R_(2))` undergoes partial reflection and refraction at other surface of slab. The angle between the reflected ray `(R_(3))` and refracted ray `(R_(4))` is

Options

A. `45^(@)`
B. `135^(@)`
C. `10%^(@)`
D. 75^(@)`

Answer

C