Define the following terms in the context of spherical mirrors : (a)

1.	Define the following terms in the context of spherical mirrors : (a) Pole (b) Centre of curvature (c) Principal axis (d) Principal focus
Answer» (a) Pole : Centre of the reflecting surface of the mirror. (b) Centre of curvature : The centre of the hollow sphere of which the reflecting surface of mirror is a part. (c) Principal axis : Straight-line passing through the pole and the centre of curvature of a spherical mirror. (d) Principal focus : Incident rays parallel to principal axis, after reflection, either converge to or appear to diverge from a fixed point on the principal axis called principal focus of the spherical mirror.

Define the following terms in the context of spherical mirrors : (a) Pole (b) Centre of curvature (c) Principal axis (d) Principal focus

Answer»

(a) Pole : Centre of the reflecting surface of the mirror.

(b) Centre of curvature : The centre of the hollow sphere of which the reflecting surface of mirror is a part.

(c) Principal axis : Straight-line passing through the pole and the centre of curvature of a spherical mirror.

(d) Principal focus : Incident rays parallel to principal axis, after reflection, either converge to or appear to diverge from a fixed point on the principal axis called principal focus of the spherical mirror.

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