Question

A ray of light in air strikes a glass slab at an angle of 30* . Calculate the angle of refraction if refractive index of glass is 1.5 .

Answer 1

Given:
angle of incidence=i=30
angle of refraction=r=?
refractive index =n=1.5
using snell's law:
n₁sini=n₂sinr
1xsini=1.5 sin r[since n1=refractive index of air]
sinr=sini/1.5
sinr=sin30⁰/1.5
=0.5/1.5=0.33
sinr=0.33
further u can calculate the value of r by using sin tables

Answer 2

Given:

angle of incidence=i=30

angle of refraction=r=?

refractive index =n=1.5

using snell's law:

n₁sini=n₂sinr

1xsini=1.5 sin r[since n1=refractive index of air]

sinr=sini/1.5

sinr=sin30⁰/1.5

=0.5/1.5=0.33

sinr=0.33

further u can calculate the value of r by using sin tables

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