what is the power of lens ? write SI unit of power of lens and Write the equation showing relation power power of lens and focal length
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Power of a lens :
When a beam of light passes through a lens it gets deviated from its path. The deviation in the path of light produced by the lens is expresses in terms of power. A lens which produces more deviation has more power.
Definition:
The deviation of the incident light rays produced by a lens on refraction through it, is a measure of its power.
Relation b/w power & lens:
Power of lens (in diopter) = 1/focal length (in m)
- P = 1/f
Power of convex lens is positive and negative for concave lens.
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