Question

14. Calculate the RADIUS OF CURVATURE if the FOCAL LENGTH of a
concave mirror is 20cm.
O 5 cm
O 30 cm
O 40 cm
O 60 cm​

Answer 1

Answer:

40 cm

Explanation:

Let us consider R is a radius

And f is a focal length

As we know R=2f

Given f=20cm

Now R =2×20=40

Hence the answer is 40cm

Option D is the right answer