Question

A beam of light consisting of red, green and blue colours is
incident on a right-angled prism as shown. 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.
The prism will
(a) separate part of the red colour from the green and
blue colours.
(b) separate part of the blue colour from the red and
green colours.
(c) separate all the three colours from one another.
(d) not separate even partially any colour from the other
two colours.

Answer 1

For total internal reflection, i > ic Here i = 450 sini/sinr = μ sin 450 >1/μ μ>1/√(2) = 1.414 μred 1.414 and μ violet> 1.414 .Hence, green and ...

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