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Dispersion of Light

A white light...

Question

A white light source is placed in a denser medium. For a ray of white light, shown in the diagram below, the angle of incidence equals the critical angle for green color light. Which colors are reflected back?

A

Violet

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B

Indigo

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C

Yellow

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D

Blue

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Solution

The correct options are
A Violet
B Indigo
D Blue
(i) When white light passes through a prism, it undergoes dispersion. Here violet, indigo and blue colors are more deviated than green, yellow, orange and red colours $μ_{v i o l e t} > μ_{r e d}$ .
(ii) Red, orange and yellow pass into rarer medium; blue, indigo and violet reflect back into denser medium.

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