Question

Describe the following terms in connection with spherical mirrors.
a. Pole b. Principal focus



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Answer 1

Answer:

a)Pole: The middle point of the reflecting surface of a spherical mirror is called pole.

The letter P represents pole, MP = M’P.

b)Principal focus: The mid-point of CP is called focus (F). It is the point on the principal axis of a spherical mirror where all incident rays parallel to the principal axis meet or appear to diverge after reflection.

Explanation:

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Answer 2

Answer:

Pole:

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

It lies on the surface of the mirror.

The pole is usually represented by the letter P.

Principal focus:

A number of rays parallel to the principal axis are falling on a concave mirror.Observe the reflected rays.

They are all meeting/intersecting at a point on the principal axis of the mirror.

The principal focus is represented by the letter F.