Question

Find the radii of curvature of a concavo- convex convergent lens made of glass with the refractive

index n = 1.5 having focal length of 20% one of the radii of curvature is double the other​

Answer 1

in differential geometry, the radius of curvature, R, is the reciprocal of the curvature. For a curve, it equals the radius of the circular arc which best approximates the curve at that point. For surfaces, the radius of curvature is the radius of a circle that best fits a normal section or combinations thereof.