What is the power of a convex lens whose focal length is 80 cm?

Given: 

Focal length, $f$ = $+$80 cm = $+$0.8 m

To find: ​​Power of a lens, $P$.

Solution:

We know that power of the lens is given by-

$Power\ (P)=\frac {1}{f}$

Substituting the given value we get-

 $P=\frac {1}{0.8}$

 $P=\frac {10}{8}$

 $P=+1.25D$

Hence, the power of the lens is 1.25 D.

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Updated on: 10-Oct-2022

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