Question

Define the following: (a) Pole,(b) Principal Focus, (c) Centre of curvature
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Answer 1

Answer:

• Centre of curvature: Centre of curvature of a spherical mirror is the centre of the hollow sphere of glass of which the mirror is a part.
• Pole: The centre of a spherical mirror is called its pole.
• Principal focus: It is the point where light rays originating from a point on the object converge. The principal focus is defined as the point where a beam parallel to the principal axis appears to diverge converges from a point on the principal axis after passing through the lens.

Answer 2

Explanation:

POLE:Geometrical centre of a mirror is known as pole of a mirror.

PRINCIPAL FOCUS:The point between Centre of curvature and pole of the mirror where all the Reflected light rays of a parallel incident light rays meet.

CENTRE OF CURVATURE:Centre of curvature of a spherical mirror is the centre of the hollow sphere of a glass of which the mirror is a part.