Question

. If the focal length of a concave mirror is 12 cm, find its radius of curvature.
(I want a pic)​

Answer 1

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Radius of curvature = 24cm.

${\huge{\boxed{\mathcal{\red{Explanation}}}}}$

For any type of spherical mirror either concave or convex the radius of curvature is the distance between it's curvature and pole.

• Curvature of a mirror is the geometrical centre of the sphere whose the mirror is a part of.

Now there is a fact that distance between focus and pole = distance between curvature and focus.

Distance between focus and pole is called focal length.

Thus we can say:

Radius of curvature = 2 × focal length

Thus in this case

radius of curvature = 2 × 12

$= 24cm$

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BY SCIVIBHANSHU.

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