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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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