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Question

Spherical aberration in a thin lens can be reduced by:

A
using a monochromatic light
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B
using a doublet combination
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C
using a circular annular mask over the lens
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D
increasing the size of the lens
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Solution

The correct option is C using a circular annular mask over the lens
Spherical aberration is caused due to large aperture.If aperture is reduced by using a circular annnular mask over it can be reduced.

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