Question

Define the term pole and principle axis?

Answer 1

Answer:

POLE: the centre of the reflecting surface of a spherical mirror is a point called the pole.

PRINCIPAL FOCUS: the principal focus of a spherical mirror is a point on its principal axis to which the reflected light rays either coverge or appears to diverge from it.

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Answer 2

Answer:

Explanation:

A line passing through the centre of the surface of a spherical mirror or lens and through the centre of curvature of all segments of the mirror or lens is called principal axis.

The point where the principal axis pierces the mirror is called the pole of the mirror