Define 1 dioptre of power of a lens.

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Solution

Dioptre is the unit of measurement of the optical power of an optical instrument, like a lens or a mirror. Power is equal to the reciprocal of the focal length. So, 1 doptre can be written as:
$1 D = \frac{1}{1 m}$

In other words, 1 dioptre is defined as the power of a lens of focal length 1 metre.

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Which of the following statements is true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m.
(b) A convex lens has -4 dioptre power having a focal length -0.25 m.
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Define 1 dioptre of power of a lens.

Dioptre is the unit of measurement of the optical power of an optical instrument, like a lens or a mirror. Power is equal to the reciprocal of the focal length. So, 1 doptre can be written as: 1 D=11 m In other words, 1 dioptre is defined as the power of a lens of focal length 1 metre.