Question

i) Fill in the blank.
The power of a lens with focal length 20 cm is​

Answer 1

The power of the convex lens is SD.

Solution :

Given: Focal length (f)=20 cm =0.2 m

To find: Power of the lens (P)

Formula: P=1f(m)

Calculation: From formula,

P=10.2

=5D

Answer 2

$f = r \div 2$

$f = 20 \div 2 = 10$

$thus \: f \: = 10cm$

$hope \: this \: helps \: you$

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