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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=1f
Concave lens, with a virtual focus, has negative focal length and hence, negative power.

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