A doctor has prescribed a corrective lens of power +1.5D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
Ans:-
P=+1.5D
f=?
P=1/f
f=1/P
=1/1.5
=10/15
=0.66m
As the power of the lens is positive it is a convex lens or a converging lens.
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the power of the lens is positive it is a convex lens
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