Question

What is spherical aberration? how can this defect be minimized in ordinary lenses. of physics?​

Answer 1

Answer:

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• When a parallel beam of light hit on the surface of a lens, refraction of the light occurs and it forms an image. In order to produce a clear and perfect image, focal point of all rays in a beam of light should be same. In a normal lens, the light rays do not converge on the same point and makes the image to appear blurred. This intrinsic defect produced is known as 'spherical aberration'.

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Ways to minimize the spherical aberration:

• By using stops i.e. by placing an opaque sheet with a hole, so that light is focused on the center of the lens and the aperture is reduced.
• By using a pair of convex lenses that are placed apart from each other in a distance equal to difference in their focal lengths.

Answer 2

Answer:

By using stops i.e. by placing an opaque sheet with a hole,

Explanation:

By using stops i.e. by placing an opaque sheet with a hole, so that light is focused on the center of the lens and the aperture is reduced. By using a pair of convex lenses that are placed apart from each other in a distance equal to difference in their focal lengths.