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Question

Chromatic aberration(distance between the focal lengths for extreme wavelengths) of a convex lens can be reduced by(Assume lenses are kept in vacuum)Adding a convex lensAdding a concave lensDecreasing focal length by squeezing itDecreasing aperture without changing it curvature

A
B
Decreasing aperture without changing it curvature
C
D
Decreasing focal length by squeezing it
Solution
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It can be reduced by "Decreasing aperture without changing it curvature"option D is correct

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