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A doctor has prescribed a corrective len...

A doctor has prescribed a corrective lens of power + 1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging ?

Text Solution

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Power of lens, P=1/f
P=1.5D
f=1/1.5=1/15=0.66m
A convex lens has a positive focal length. Hence it is a convex lens or a converging lens.
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