Question

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

Answer 1

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'.

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:

Answer ♡

• 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.