Dioptre is the SI unit of power of lens, It is denoted by the letter D.
1 dioptre can be defined as the power of a lens of focal length 1 metre.
Power of lens (P) = 1 / f (in m)
S.I unit of Power = m-1 or, Diopter (D)
Dioptre is the SI unit of power of lens, It is denoted by the letter D.
1 dioptre can be defined as the power of a lens of focal length 1 metre.
Power of lens (P) = 1 / f (in m)
S.I unit of Power = m-1 or, Diopter (D)