What do you understand by the focus and focal length of a spherical mirror? Show them on the separate diagrams for each of a concave mirror and a convex mirror.

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Solution

The focus of a concave mirror is a point on the principal axis at which the light rays incident parallel to the principal axis meet after reflection from the mirror.

The distance of the focus from the pole of the mirror is called the focal length and it is marked as FP.

The focus of a convex mirror is a point on its principal axis at which the light rays incident parallel to the principal axis appear to meet after relfection from the mirror.

The distance of the focus from the pole of the convex mirror is called the focal length and it is marked as PF.

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