Light ray is travelling from a medium of refractive index `mu` in to air. Angle of incidence at the interface is `53^(@)`. Light ray is found to suffer total internal reflection. Select possible values of `mu` from the following :

Options

A. 1.2
B. 1.3
C. 1.4
D. 1.6

Answer

B, C, D

Explanation

If light ray is reflected internally at an angle `53^(@)` then it means critical angle for the pair of mediums must be less than `53^(@)`.
`sin^(-1)((1)/(mu))gt 53^(@)`
`rArr" "(1)/(mu) gt sin 53^(@)`
`rArr" "(1)/(mu gt (4)/(5)`
`rArr" "mu gt 1.25`
Options (b), (c) and (d) satisfy above condition and hence are correct options.