Question

A ray of light passes through an equilateral prism (refractive index `1.5`) such that angle of incidence is equal to angle of emergence and the latter is equal to `3//4 th` of the angle of prism. Calculate the angle of deviation.
A. `60^(@)`
B. `30^(@)`
C. `45^(@)`
D. `120^(@)`

Answer 1

Correct Answer - B
Here, `A = 60^(@) =, mu = 1.5`,
`I = e = 3/4 xx 60^(@) = 45^(@)`
`A + del = i + e`
`:. 60^(@) + delta = 45^(@) + 45^(@) rArr delta = 90^(@) - 60^(@) = 30^(@)`