Derive a relation between the focal length and radius of curvature of a Plano convex lens made of
glass. Compare the relation with that of a concave mirror. What can you conclude? Justify your
answer
Dear Student!!
Using the lens maker formula,
Focal for concave mirror is,
f = R/2
Both converges parallel rays of light coming from infinity parallel to the principle axis at the focus.
For the same radius of curvature focal length of the plano-convex lens is always greater then that of concave mirror.