MHT CET 2023 Physics question

The rays of different colours fail to converge at a point after passing through a thick converging lens. This defect is called.

(A)spherical aberration
(B)distortion
(C)coma
(D)chromatic aberrationCorrect

Answer: (D)

Solution

The refractive index of the lens material depends on wavelength (it is larger for violet than for red), so the focal length is different for different colours and the rays of different colours converge at different points. This defect is chromatic

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Question ID VK-094694