1.

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?

Answer»

SOLUTION :`P=+1.5D`
`F=?`
`f=1/P=1/1.5=10/5=0.667m`
`f=66.67cm`
SINCE f is positive, LENS is convex (converging lens).


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