The Power Of Lens Is 2.5 Dioptre. What It's Focal Length.

As given Power of lens $P=2.5\ D$

Let $f$ be the focal length of the lens.

As known focal length of a lens $f=\frac{1}{P}$

$=\frac{1}{2.5}$

$=0.4\ m$

$=40\ cm$
 

Thus, the focal length of the lens is $40\ cm$.

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Updated on: 10-Oct-2022

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