Question

what is relationship between radius of curvature and focal length in lenses

Answer 1

the radius of curvature is the double of focal length.......

i.e., R=2f
or, f=R/2

Answer 2

Hii mate!!
Your question has been answered here

Relationship between radius of curvature and focal length are :-

R = 2f

Or it can also written like this

f = R/2


Hope it helps you.