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. `1.3`
B. `1.4`
C. `1.5`
D. `1.6`

Answer

C, D

Explanation

As `mu = (1)/(sin C)` and Here, `I = C = 45^(@)`
`:. Mu = (1)/(sin 45^(@)) = sqrt(2) = 1.414`
For total internal reflection `mu gt 1.414`,
`:.` both options 'c' and 'd' are correct.