Question

if the focal length of a convex lens is 20cm its power will be..
(a)2 diopters(b)3 diopters(c)4 diopters(d)5 diopters

Answer 1

Answer:

The answer is 5D

option- ( d ) is correct option

Explanation:

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Answer 2

(d)$5$ diopters, is the power of the convex lens.

Step by step calculation

Given data:

the focal length of a convex lens is$=20cm$

To find:

We must find the power of the convex lens.

Formula to be used:

power$=\frac{1}{f}$

where: $f=$0.2 m (focal  length in meters)

Solution:

Using the formula:

power $=\frac{1}{f}$

$=\frac{1}{0.2}$

$=5 diopters$

Therefore the power of the convex lens is $5$ diopters

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