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2016-03-17T20:31:25+05:30
Radius of curvature = 2  X focal length

R = 2f


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2016-03-17T21:09:38+05:30

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Radius of curvature = 2  X focal length 
radius of curvature is double its focal length

R=2f

this
 is the relation between radius of curvature and focal length of a concave mirror 
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