Question

the focal length of a concave mirror is 20 cm find its radius of curvature​

Answer 1

F = R/2

=> 20 = R/2

=> R/2 = 20

=> R = 40 cm.

[R is radius of curvature.

f is focal length.]

OR :-

R = 2 f

= 2×20

= 40 cm.

hope it helps plz mark me as BRILLIANT ❤️.. .. ..