Answers

2016-03-12T13:08:40+05:30
Focus is am imaginary point lies between center of curvature and  pole from where we passes one light ray
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2016-03-12T15:17:43+05:30
Focus is an imaginary point which is between the pole of the sphereical
mirror and radius of curvature i.e R
and have a relation between r and F
R=2F
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