Question

The radius of curvature of a spherical mirror is 20 cm. what is its focal length? ​

Answer 1

We know,

Radius of curvature = 2 × focal length

==> 20 = 2*f

==> f = 20/2

==> f = 10 cm

Hence, focal length of the given spherical mirror is 10 cm.

Answer 2

Answer:

we know that

Explanation:

radius of curvature,R = 20 cm

focal lenght,f = ?

so,

R = 2 × f = 2f

20cm = 2f

f = 20/2 cm

f = 10 cm

Hope it will help you