Question

When sun light is made incident on a glass plate at 60o, the reflected light is found be perfectly plane polarised. The angle of refraction will be??

Answer 1

Answer:

From Brewster's law

μ=tani

p

⇒

v

c

=tan60

o

=

3

⇒ v=

3

c

=

3

3×10

8

=

3

×10

8

m/s

Answer 2

When the angle of incidence on a material is 60^(@), the reflected light is completely polarised. The velocity of the refracted ray inside the materials is (in m//sec^(-1)) =v=c√3=3×108√3=√3×108m/sec.