First slide

The lens

Question

Chromatic aberration of lens can be corrected by

Moderate

A

Reducing its aperature
B

Proper polishing of its two surfaces
C

Suitably combining it with another lens
D

Providing different suitable curvature to its two surfaces

Solution

The chromatic aberration formed by a convex lens is considered positive and that by a concave lens is considered negative, as they have got exactly opposite characteristics. So the chromatic aberration formed by one lens can be nullified by the suitable use of the second lens.

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