Question

If the radius of curvature of a sphere mirror is 20 cm what is it focal length?

Answer 1

$\huge{Heya}$

The answer of u r question is 10cm.

Explanation

Given,

Radius of curvature = 20 cm = R

We know that final length

$f = \frac{r}{2} = \frac{20}{2} cm$

So

f = 10 cm

Thus, the focal length of the sperical mirror is 10 cm

Answer 2

Heya.....

your answer is......

given:

radius of curvature=20cm

we know that;

f=r/2

f=20/2

so,

f=10

hope it helps you:)