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Power of a Lens

The power of ...

Question

The power of a lens is negative. State whether it is convex or concave?

A

Concave

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B

Convex

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C

Both A & B

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D

can't say

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Solution

The correct option is A Concave
Power of lens is the reciprocal of the focal length
$P = \frac{1}{f}$
Concave lens, with a virtual focus, has negative focal length and hence, negative power.

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