Question

A ray of light experience a minimum deviation when passing symmetrically through an equilateral prism calculate the angle if incidence of the ray. refractive incidence 1.5

Answer 1

Answer:

Minimum deviation δ=2i−A

where A is prism angle A=60

o

For minimum angle the angle of refraction should be half of prism angle.

So r=A/2=30

o

now using the snell's law

n

air

sini=n

glass

sinr

sini=1.5sin30

i=48.6

o

, incidence angle

Minimum deviation δ=2i−A

δ=2×48.6−60=37.9

o