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Q.

When a beam of white light is allowed to pass through convex lens parallel to principal axis , the different colours of light converge at different points on the principle axis after refraction . This is called .

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a

Chromatic aberration

b

Spherical aberration

c

Polarisation

d

Scattering

answer is B.

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Detailed Solution

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A lens will not focus different colours in exactly the same place. Because the focal length depends on the wavelength of individual light, and the wavelength is different for different colours . 

This is called chromatic aberration.

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