Question

A concave mirror is a part of hollow sphere of
radius 40 cm. What will be the focal length of
concave mirror ?​

Answer 1

Explanation:

The relationship between the radius of curvature and focal length is that the radius of curvature is twice the focal length. In other words, focal length is half the radius of curvature.

In this case, radius of curvature of the concave mirror is given as 40 cm. Hence, the focal length of the mirror is

2

40

=20cm.

Hence, the focal length of the

Answer 2

Answer:

we know that focal length of the mirror is double it's curvature

therefore,if the radius is 40

then the focal length is half radius

that is 40/2

=20

therefore ,focal length of concave mirror is 20cm.

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