Q.

What do you understand by pole of a spherical mirror?


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a

It is the centre of the sphere of which the reflecting surface of the spherical mirror is a part.

b

  It is the centre of the reflecting surface of the spherical mirror.

c

It is the radius of the sphere of which the reflecting surface of the spherical mirror is a part.

d

  The point at which rays parallel to the principal axis after being reflected by a spherical mirror meet or originate from a point on the principal axis. 

answer is B.

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Detailed Solution

Pole is the centre of the reflecting surface of the spherical mirror.
The pole is the centre point of the spherical mirror. The point where the principal axis penetrates the mirror is called the mirror pole. Poles are usually denoted by the letter P. The straight line connecting the pole (P) and the centre of curvature is the major axis.
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