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Power of a Lens

If a lens has...

Question

If a lens has a focal length, f = -12 cm. then it is a

A

Can be convex or concave

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B

Concave lens

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C

Convex lens

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D

Convex lens

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Solution

The correct option is B
Concave lens

From the sign convention, the focal length of concave lens is negative.

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