Question

A doctor has prescribed a corrective lens of power + 1.D .Find the focal length of the lens. Is the prescribed lens diverging or converging. *​

Answer 1

Answer:

Power of the lens = P = + 1 D

Formula to find P = 1/f.

Hence, f = 1/P.

So, Focal length = 1/1

Focal length = 1 m

The power is positive, so the lens is converging.

Hence, Focal length = 1 m and the lens is converging.

MORE INFORMATION:

Power of the lens is said to be the reciprocal of the focal length of the lens in metre.

1 metre focal length is equal to 1 Dipotre of Power.

If the lens has negative power, the focal length is also negative, and the lens is diverging.

Similarly, if the power is positive, the focal length will be positive and the lens will be converging.