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Question

Define 1 dioptre of power of a lens.


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Solution

1 dioptre of power:

  1. 1 dioptre of lens power is defined as the unit of measurement of a lens's or curved mirror's optical power equal to the reciprocal of focal length (f).
  2. P=1f=1D
  3. The focal length is measured in metres.
  4. The SI unit of lens power is dioptre, which has a focal length of one metre and is denoted by the letter D.

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