Question

The radius of curvature of a spherical mirror is 70 cm. What is its focal length ?​

Answer 1

Answer:

The focal length of the given spherical mirror is 35cm.

Explanation:

We have-

Radius of curvature,

R = 70 cm

Radius of curvature of a spherical mirror

= > 2 x focal length(f)

=> R = 2f

=> f = R/2

=> f = 70/2

=> f = 35cm.

Hence, the focal length of the given spherical mirror is 35cm.

Answer 2

Explanation:

We all know, r = 2f

Hence, f = r/2

F = 70 / 2

f = 35 cm

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