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Paraxial Approximation

A mirror whic...

Question

A mirror which can focus the parallel rays after reflection from its surface is:

A

Must be parabolic

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B

May be parabolic

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C

Must be spherical

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D

May be elliptical

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Solution

The correct option is A
Must be parabolic

We have seen in the derivation that to achieve the perfect focus at a point, the shape of the mirror must be a parabola.

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