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
• B. red colour suffers more deviation
• C. red colour suffers less deviation
• D. deviation depends on the angle of prism

Answer 1

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.