Question

focal length of a concave lens is 10cm, its radius of curvature will be (a) 40cm (b) 30cm (c) 20cm (d) 10cm​

Answer 1

Answer:

Answer:

• Radius of curvature of a concave lens=20cm

Given:

• Focal length of a concave lens,f=10cm

To find:

• Radius of curvature of a concave lens,R=?

Solution:

As we know that,

Radius of curvature of a concave lens is equals to the twice of the focal length.

R=2×f

R=2×10cm

R=20cm

So, the radius of curvature of a concave lens is 20cm.

Explanation:

Hope it helps you.......

Answer 2

Answer:

The correct answer is 20cm