What is spherical aberration? how can this defect be minimized in ordinary lenses. of physics?
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Spherical Aberration is an optical problem that occurs when all incoming light rays end up focusing at different points after passing through a spherical surface.
These lens defects can frequently be reduced by limiting the outer edges of the lens from exposure to light using diaphragms, and also by utilizing aspherical lens surfaces within the optical system.
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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.
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