Question

the radius of curvature of mirror is 20cm the focal length is​

Answer 1

$\huge{\mathcal{\blue{\underline{Answer}}}}$

Radius of curvature = 2(focal length)

20cm = 2(f)

f= 20cm/2

Focal length :

$\huge{\mathcal{\blue{\underline{10cm}}}}$

Answer 2

Answer:

Focal length = radius of curvature / 2

=20cm/2

=10cm