Question

The focal length of a spherical mirror with radius of curvature 15 cm is _________ *​

Answer 1

Answer:

15/2

Explanation:

We know that

Focal length= radius / 2.

so answer is 15/2 = 7.5

Answer 2

Answer:

R = 30 cm

Explanation:

In order to find the radius of a mirror,

We have f - 15.

We use the relations between the radius an focal length i.e. R= 2F

Putting the value of focal length (f) i.e. 15 cm, given in the sum,

We get R= 30 cm

Hope it helps :)