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A doctor prescribes a rectifier lens of power +1.5 D. Find the focal length of the lens. Is the lens converging or diverging?
Here P = 1.5 D
Power of lens P = 1/f (m)
f = 1/p
f = 1/1.5
f = 10/15
f = 2/3 m
Therefore, f = positive. Thus, it is a converging (convex) lens.
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