A ray of light falls on a transparent glass slab of refractive index `1.62`. If the reflected ray and the refracted rays are mutually perpendicular, what is the angle of refraction ?

Answer

`31.7^(@)`

Explanation

`tan i_(p) = mu = 1.62`
`:. i_(p) = tan^(-1) (1.62) = 58.3^(@)`
`r = 90^(@) - i_(p) = 90^(@) - 58.3^(@) = 31.7^(@)`