Mammoth Memory

Convex mirrors: radius of curvature

We should all know what a radius of a sphere is, so it should be easy to remember that:

The "radius of curvature" of a convex mirror is usually discussed as the distance from the vertex (v) to the centre of curvature (c) (even though it can be the distance from any point on the circle to the centre of curvature).

Diagram showing the radius of curvature of a convex mirror

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