Question

lens power what is explain me please friends ​

Answer 1

The power of a lens is defined as the reciprocal of its focal length in meters,

$\sf {or\ D = \frac{1}{f} }$

where D is the power in diopters and f is the focal length in meters. Lens surface power can be found with the index of refraction and radius of curvature.

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Answer 2

Lens power can be generally called as sight.for a myopic patient lens power is negative where as hypermetropic patient lens power is power.it is based upon focal length of spectacle lens
D(lens power)=1/F(in meters)

(Or)
D(lens power)=100/F(in centimetre)

F=focal length of lens