Question

a concave mirror has focal length of 20 cm.calculate its radius of curvature​

Answer 1

Explanation:

r=2f

f=20cm

therefore,

r=2*20

r=40cm

hope it helps you!!

Answer 2

Answer:

40 cm

Explanation:

Given :

Focal length = 20 cm

We know :

Radius of curvature​ = Twice of focal length.

R = 2 * 20 cm

R = 40 cm

Therefore , radius of curvature is 40 cm.