# focal length of lens may be determined by the given power of the lens

2
by sameekshasam19
yes, so?!
do u need to know how?

2015-08-03T23:48:36+05:30

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).

2015-08-04T00:33:43+05:30

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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.

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