#### Question

Define 1 dioptre of power of a lens.

#### Solution 1

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.

#### Solution 2

1 dioptre is the power of a lens whose focal length is 1 metre.

Is there an error in this question or solution?

Solution Define 1 Dioptre of Power of a Lens. Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens.