Question

What is focal length and how is it related to radius of curvature
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Answer 1

focal length is a distance between pole and focus.

Radius of curvature= 2focal length

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Answer 2

Focal length (f) is the distance from mirror at which the light rays coming parallel from infinity meet.

Radius of Curvature R is the radius of the sphere of which the mirror is a part.

Focal length and radius of curvature are related as:

f= R/2

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