: +91 124 4007927

# POWER OF A LENS

### POWER OF A LENS

Posted on

Power of lens is a measure of the convergence or divergence, which a lens introduces in the light falling on it.”

It is defined as the tangent of the angle by which it converges or diverges a beam of light falling at unit distant from the optical centre.

Thus, Power of a lens is the reciprocal of focal length.

When focal length is measured in metre then power is taken in dioptre (D).

For converging lens,, therefore P=+ve

For diverging lens, , therefore P =– ve.