Question

The prism shown in figure has a refractive index of `1.60` and the angles A are `30^@.` Two light rays P and Q are parallel as they enter the prism. What is the angle between them after they emerge? `[sin^-1(0.8)=53^@]`

Answer 1

Correct Answer - D

`mu=sin i/sin 30^@`
`:. sin i=mu sin 30^@`
`=(1.6)(1/2)=0.8`
`:. i= 53^@`
P ray deviates from its original path by an angle,
`delta=i-30^@=23^@`

`:.` Angle between two rays, `theta=2 delta`
`=46^@`