Question

The radius of curvature of a spherical mirror is 30 cm. What is its focal length ?​

Answer 1

Answer:

The focal length of the given spherical mirror is 15 cm

Explanation:

We have-

Radius of curvature,

R = 30 cm

Radius of curvature of a spherical mirror

= > 2 x focal length(f)

=> R = 2f

=> f = R/2

=> f = 30/2

=> f = 15 cm.

Hence, the focal length of the given spherical mirror is 15 cm

Answer 2

Given : The radius of curvature of a spherical mirror is 30 cm.

To find : The focal length of the spherical mirror.

Solution :

The focal length of the spherical mirror is 15 cm.

We can simply solve this numerical problem by using the following process. (our goal is to calculate the focal length of the spherical mirror by using the given value of the radius of curvature)

Now, we know that -

f = R/2

Where,

• f = focal length of spherical mirror
• R = radius of curvature of spherical mirror

So, by putting the given values, we get -

f = 30/2

f = 15 cm

(This will be considered as the final result.)

Hence, the focal length of the spherical mirror is 15 cm