A ray of light travelling in a transparant medium falls on a surface separating the medium from air at an angle of incidence of `45degree`. The ray undergoes total internal reflection. If n is the refractive in index of the medium with respect to air, select the possible value (s) of n from the following:

Options

A. `mu = 1.33`
B. `mu = 1.40`
C. `mu = 1.50`
D. `mu = 1.25`

Answer

C

Explanation

For total internal reflection, `mu ge (1)/(sin C)`
`mu ge (1)/(sin 45^@)` or `mu ge sqrt(2) (=1.414)`
`:. mu = 1.5`.