Question

If the radius of curvature of a lens is 30 cm, then what is its focal length?​

Answer 1

The value of the focal length is f = 15cm.

We are given that:

Radius of curvature = 30cm

To Find: focal length 'f'

Solution:

• As we know that the radius of curvature (R) = 30 cm
• The value of radius is equal to two times the focal length i.e.
• R = 2f
• To find focal length, let's divide the radoiuns by 2.
• or f = R / 2
• or f = 30 /2
• so, f = 15 cm

Thus the value of the focal length is f = 15cm.

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