Question

The focal length of epic convex lens is 20cm.What is the radius of curvature​

Answer 1

Answer:

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

Thank you

Answer 2

Answer:

A convex lens of focal length 20 cm is placed coaxially with a convex mirror of radius of curvature 20 cm. The two are kept at 15 cm from each other. A point object placed 40 cm in front of the convex lens. Find the position of the image formed by this combination.