Define 1dioptre

1.	Define 1dioptre
Answer» 1 dioptre is a power of lens whose focal length is 1metre. The SI unit of power of lens is \'dioptre\' is denoted by the letter D. The SI unit of power of lens is dioptre which is denoted by the letter D. 1 dioptre is defined as the power of a lens of focal length 1 metre.

Discussion