Answers

2015-06-14T23:25:03+05:30
Focal length = radius of curvature/2
0
2015-06-15T08:37:18+05:30
Focal length (f) = Radius of curvature (R) / 2 .
                            (or) 
Radius of curvature (R) = 2 
× Focal length (f) .
2 2 2