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Question

A converging lens has a focal length of 50 cm. The power of this lens is : (a) + 0.2 D (b) - 2.0 D (c) + 2.0 D (d) - 0.2 D

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Solution

Convex (So Focal length is positive)

f=+50 cm=+50×102 m

P=1f=1+50×102=10050=+2 D


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