Question

the radius of curvature of a spherical mirror is 20 cm what is focal length​

Answer 1

Answer:

Explanation:

Radius of curvature = 2(focal length)

R = 2f

20cm = 2f

f = 20cm/2 = 10cm

The Focal length will be 10cm.

Answer 2

Answer:

we know that 2focal length=radius

then. r=20

f=r/2

=20/2=10

so focal length is 10

hope it helps you