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 :Given that POWER of the prescribed lens P = + 1.5 D and `P = (1)/(f)`
`THEREFORE` Focal length of the lens `f = (1)/(P) = (1)/(+1.5 D) = + 0.67` m
As the power of the lens is +ve, the lens is a converging (convex) lens.


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