Question

A beam of light consisting of red, green and blue colours is
incident on a right angled prism. The refractive index of the
material of the prism for the above red, green and blue
wavelengths are 1.39, 1.44 and 1.47, respectively. [2015 RS]
The prism will:
(a) separate all the three colours from one another
(b) not separate the three colours at all
(c) separate the red colour part from the green and blue
colours
(d) separate the blue colour part from the red and green
colours

Answer 1

Answer:

For total internal reflection, i>i

c

Here i=45

0

sinr

sini

=μ

sin45

0

>

μ

1

μ>

2

1

=1.414

μ

red

<1.414 but μ

green

>1.414 and μ

violet

>1.414.

Hence, green and violet will be totally internally reflected.

Red will be refracted.

Answer 2

Answer:

I hope the picture helps u

By:Tamilini