Question

the distance between the pole and focal point of a concave lens is 15cm then it's radius of curvature is ​

Answer 1

Answer:

the radius of curvature will be 30 cm.

Explanation:

this is because focal length is half of the radius

Answer 2

Answer:

radius is 30cm

Explanation:

since f=r/2

15=r/2

cross multiply

r=15*2

r= 30cm