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Question

A real image of a distant object is formed by a plano-convex lens on its principal axis. Spherical aberration is :
  1. absent.`
  2. same, whichever side of the lens faces the object.
  3. smaller, if the plane surface of the lens faces the object.
  4. smaller, if the curved surfaces of the lens face an object.

A
same, whichever side of the lens faces the object.
B
smaller, if the curved surfaces of the lens face an object.
C
smaller, if the plane surface of the lens faces the object.
D
absent.`
Solution
Verified by Toppr

The spherical aberration occurring in the image of the plano-convex lens will be minimum when the curved surface faces the object and the light from the object first falls on the curved surface. It happens because the deviation of the ray, in this case, is distributed between the two surfaces.

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