Question

(a)what is meant by radius of curvature of a spherical mirror? How is it related to focal length of the mirror?

Answer 1

The reflecting surface of a spherical mirror forms a part of a sphere. This sphere has a radius, which is known as the radius of curvature of the spherical mirror.

Radius of curvature is equal to twice the focal length.

R=2f

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Answer 2

Explanation:

• Radius of curvature of a spherical mirror is defined as the distance between the pole and the centre of curvature of the mirror.
• Spherical mirrors are called so because they are a part of sphere.
• Focal length of a mirror is the distance between the focus and the pole of the mirror.
• The relation between radius of curvature and the pole of the mirror is :

R = 2f

f is focal length

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