A ray of light travelling in a transparent medium of refractive index µ, falls on a surface separating the medium from air at an angle of incidence of 45º. For which of the following value of µ the ray can undergo total internal reflection -

Question

( A ) µ = 1.33
( B ) µ = 1.50
( C ) µ = 1.25
( D ) µ = 1.40