Question

if power of lense is 15 then find its focal length step wise

Answer 1

Power of lens is 15 D
by the formula
$f = \frac{1}{p}$
$focal \: length = \\ = > \frac{1}{15} m \\ = > \frac{1}{15} \times 100 \: cm \\ = > 6.67 \: cm \:$