Question

The reflected light is found to be plane
polarised when an unpolarized light
falls on a denser medium at 60° with
the normal. Find the angle of refraction
and critical angle of incidence for total
internal reflection in the denser to rarer
medium reflection.​

Answer 1

Answer:

Let

′

θ

c

′

be the critical angle.

n

1

sinθ

c

=n

2

sin90

o

sinθ

c

=

n

1

n

2

Brewster's angle

tanθ

b

=

n

1

n

2

sinθ

b

=

n

1

2

+n

2

2

n

2

Given,

sinθ

b

sinθ

c

=1.28

n

1

2

+n

2

2

n

2

n

1

n

2

=1.28

Solving the above equation, we get,

n

1

n

2

=0.8