Define 1 dioptre power of a lens.

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Solution

1 dioptre of power of a lens is defined, as the power of a lens of focal length 1 m.

1 dioptre is SI unit of the power of a lens whose focal length is 1 metre. It is denoted by the letter D . thus $1 D = 1 m^{- 1}$

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Which of the following statements is true?
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Q. 1 dioptre is the power of a lens whose focal length is:

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Define 1 dioptre power of a lens.

1 dioptre of power of a lens is defined, as the power of a lens of focal length 1 m. 1 dioptre is SI unit of the power of a lens whose focal length is 1 metre. It is denoted by the letter D . thus 1 D=1 m−1

1 dioptre of power of a lens is defined, as the power of a lens of focal length 1 m.

1 dioptre is SI unit of the power of a lens whose focal length is 1 metre. It is denoted by the letter D . thus $1 D = 1 m^{- 1}$