First slide

The lens

Question

Spherical aberration in a lens

Moderate

A

Is minimum when most of the deviation is at the first surface
B

Is minimum when most of the deviation is at the second surface
C

Is minimum when the total deviation is equally distributed over the two surface
D

Does not depend on the above consideration

Solution

When a beam of light passes through a system of two thin lenses placed coaxially at a distance apart from each other, the refraction takes place at four surfaces. The spherical aberration is Minimum when there is an equal deviation on the surfaces.

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