Question

Define principal focus of a spherical mirror.

Answer 1

The principal focus of a spherical mirror is a point on the principal axis of the spherical mirror at which, the light rays which are parallel to the principal axis actually converge (meet) or appear to diverge after reflection.
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Answer 2

In a spherical mirror, the principle focus is a point on principal axis, light rays are parallel to the axis

• A spherical mirror is a mirror that has the form of a piece cut off from a spherical surface.
• There are two types of Spherical mirrors namely the concave mirror and the convex mirror.
• After concave mirror's direct reflection the rays parallel to the primary axis converge at a specific point on the main axis.
• Their rays also tend to come from a point after reflection from a convex mirror on the main axis.