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?

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Solution

Power, $P = \frac{1}{f} = 1.5$

$f = 0.67 m$
Since, focal length is positive it is a convex lens i.e. converging lens.

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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?

Power, P=1f=1.5 f=0.67 mSince, focal length is positive it is a convex lens i.e. converging lens.

Power, $P = \frac{1}{f} = 1.5$

$f = 0.67 m$
Since, focal length is positive it is a convex lens i.e. converging lens.