SarkariPYQ

SSC CGL 2020 PYQ — Question 42

SSC CGL - 7th March 2020 Shift 1 • General Awareness • Q42

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The power of a lens is –2.0 D. Here 'D' stands for:

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Correct answer: A

Explanation

The correct answer is option 1 i.e dioptre.

  • A dioptre is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres. 
  • It is thus a unit of reciprocal length.