Which one of the following mirrors is free from spherical aberration?

convex

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concave

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parabolic

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none of these

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Solution

The correct option is C parabolic
Geometrical optics predicts that rays parallel to the principal axis are reflected by a parabolic mirror in a manner such that they unite perfectly on the parabolic axis to give an image free of spherical aberration.
Hence, option C is correct.

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