Question

State the SI unit of focal power of lens.​

Answer 1

Answer:

dioptre is the correct answer

Answer 2

‡Power Of a Lens‡

Lenses are used for converging or diverging the rays falling on them. But all the lenses do not have same power to converge, Different Power to converge or diverge.

★Power Of a Lens is its capacity to converge/diverge rays falling on it .

Quantitatively , Power of a lens is the reciprocal of the focal Length of the lens.

P (dioptre) = 1/f

★SI UNIT :-

when f is measured in metre, the unit of Power is Dioptre (D).