Question

the focal power of a lens has which dimensions

Answer 1

Thr power of the lens is defined as the tangent of the angle by which it converge ot diverge a ray of light parallel to the principal axis incidental at unit distance from the optical center....

P= 1/f
.
SI unit of power of the lens is DIOPTRE (D)......



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Answer 2

Dear User !!

Since power is given by the reciprocal of focal length of the lens {which is

having dimensions of length}, hence power is having the dimensions

of inverse of length, i.e.

power =  [M^0 L^-1 T^0]


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