Question

the focal length of convex mirror is 20 cm calculate its radius of curvature​

Answer 1

Answer:

Explanation:

Answer. => R = 40 cm. [R is radius of curvature. f is focal length.]

f = R/2

=> 20 = R/2

=> R/2 = 20

=> R = 40 cm.

[R is radius of curvature.

f is focal length.]

OR :-

R = 2 f

= 2×20

= 40 cm.

Answer 2

Explanation:

Let us consider R is a radius

And f is a focal length

As we know R=2f

Given f=20cm

Now R =2×20=40

Hence the answer is 40cm