Question

What is " Dioptre " ?

Answer 1

hi friend...

it is the unit of power...

power means the reciprocal of focal length...

p= 1/f...

hope this helps u...

Answer 2

hi friend,

☆ "Dioptre" The SI unit of a lens is 'dioptre'.It is denoted by the letter D .

☆ If f is expressed in meter, then, power is expressed in dioptre.

☆ Thus 1 dioptre is the powert of a lens whose focal length is 1 meter .

☆ The power of a convex lens is positive and that of a concave lens is negative.



hope its help you. .....