A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens.

by Doubtly (98.9k points) in Light – Reflection and Refraction asked Dec 15, 2021 733 views

edited Jun 29, 2023

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?

1 Answer

by Doubtly (98.9k points) answered Dec 15, 2021

by Doubtly selected Jun 29, 2023

Power of lens, P= 1/f
P= 1.5D
f= 1/1.5 = 10/15 = 0.66 m
A convex lens has a positive focal length. Hence, it is a convex lens or a converging lens.

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