Question

The radius of curvature of a concave mirror is 20 cm. Its focal length will be
(i) - 20 cm
(ii) - 10 cm
(iii) + 40 cm
(iv) +10 cm​

Answer 1

Answer:

So, focal length = 21× radius of curvature = 21×20 cm = 10 cm.

Answer 2

Answer:

3 answer right away hii friends