Concave lens – radius of curvature (R)
We should all know what a radius of a sphere is, so it should be easy to remember that:
The "radius of curvature" of a concave lens is the distance between the centre of curvature (C) and the curvature of sphere.
There are two radii of curvature for a concave lens, as below.
/radius-of-curvature-(r)-3-1.b6bf4f6.jpg)
