What is the principal focus of a spherical mirror?

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1. What is the principal focus of a spherical mirror?

A point from which rays appear to originate, specific only to convex mirrors

The point on the axis where parallel rays converge, or appear to diverge from, after reflection

The centre of the hollow sphere the mirror is part of

The exact midpoint of the mirror’s own surface

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The principal focus is where rays travelling parallel to the axis converge, for a concave mirror, or appear to spread out from, for a convex mirror, after reflecting.