Question

If focal length is 10 cm find power​

Answer 1

Answer:

• 10D

Solution:

Power of lens defined as the reciprocal of the focal length. It is measured in Dioptres (D).

$\sf \red\bigstar \boxed{\sf Power = \frac{1}{f}}$

• Where, f is focal length in metre.

We have length 10 cm, in metres it will be 0.1 m

$\underline{\blue{\mathfrak{Putting\: the\: value}}}$

$\sf Power = \dfrac{1}{0.1} \\\\\sf Power = \dfrac{1}{\frac{1}{10}} \\\\\sf Power = 10 D$

Hence ,

• Power is 10 Dioptres.

Answer 2

Answer:

Given, f = 10cm = 0.01 m

p = 1/f

p = 1/0.01

p = 100 D