Light is incident from glass `(mu=1.5)` to air. Sketch thevariation of the angle of deviation `delta` with angle of incident i for `0ltilt90^@`

Answer

A

Explanation

Refraction index of glass `mug=1.5`
Given `0^@ltilt90`
Let Crarr Critical angle
`rarr (sinC)/(sinr)=mu_c/mu_g`
`rarr(sinC)/90=1/15=0.66`
`rarr C=40^@48''`
The angle of deviation due to refraction from glass to air increases as te angel of incidence increases from `0^@ to 40^@ 48"`. the angle of deviaon due to tota interal refraction further increase for `40^@ 48" to45^@ ` and then it decreases.