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yes, so?!

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Power of the lens is the reciprocal of its focal length; i.e,

Power of a lens= 1/f where f is the focal length

The power of the lens is given the unit of Diopters (D).

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Power of the lens is defined as the convergence / divergence power of the lens..

The amount of deviation o f light rays = Tan Ф..

P = 100/f Dioptres when f is expressed in cm.

= 1/f Dioptres when f is in meters

focal length = 1/P in meters. with P in Dioptres.

f can be negative if P is negative. for a concave lens.

f is positive for a convex lens.

The amount of deviation o f light rays = Tan Ф..

P = 100/f Dioptres when f is expressed in cm.

= 1/f Dioptres when f is in meters

focal length = 1/P in meters. with P in Dioptres.

f can be negative if P is negative. for a concave lens.

f is positive for a convex lens.