Question

The power in diopter of magnifying lens of focal length 5cm is

Answer 1

Answer:

1 diopter is the power of a lens having focal length  1 metre

Explanation:

Answer 2

Answer:

focal length = 5cm = 5/100 metre

now,

power = 1/ focal length

$\frac{1}{ \frac{5}{100} } \\ = \frac{1 \times 100}{5} \\ = 20$

so, the power is 20 Dioptre