An eye specialist prescribes a number +4.5 to a person for his glasses .what is natural lens ? What is the focal length of the lens ?
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Explanation:
The nature of the lens prescribed is "converging" or "convex lens", as P=+ve.
As, P=1/f
=>f=1/P
=1/4.5
=10/45
= 2/9
f=0.22m
OR f=22.22cm
I hope it helps you ^_^
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