Question

define pole and focal length

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Answer 1

Answer:

The distance from the pole to the center of curvature is called (no surprise, I hope) the radius of curvature (r). The distance from the pole to the focal point is called the focal length (f). The focal length of a spherical mirror is then approximately half its radius of curvature.

Answer 2

Answer:

pole - the centre part of reflecting surface of the mirror is known as pole

focal length - the distance between the pole of the mirror and the focus is known as focal length

Explanation:

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