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Question

A ray of light containing both red and blue colours is incident on the refracting surface of a prism. Then,

A
both colours suffer equal deviation
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B
red colour suffers more deviation
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C
red colour suffers less deviation
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D
deviation depends on the angle of prism
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Solution

The correct option is C red colour suffers less deviation
Different colours of light bend through different angles with respect to the incident ray, as they pass through a prism. The light ray with more wavelength suffers less deviation than light ray with more wavelength. So the red light bends the least while the blue the most.

wavelength of red > wavelength of blue.

So option (c): "red colour suffers less deviation" is correct.

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