#### Question

Define 1 dioptre of power of a lens.

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#### 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.

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#### Reference Material

Solution for question: Define 1 Dioptre of Power of a Lens. concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens. For the course CBSE