SELECT * FROM question_mgmt as q WHERE id=3750 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=16 AND chapterId=261 and ex_no='4' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 10th science Light - Reflection and Refraction define 1 dioptre of power of a lens

Question:

Define 1 dioptre of power of a lens.

Answer:

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

∴1 D = 1 m-1

Power of lens is defined as the reciprocal of its focal length. Where P is the power of a lens of focal length f  in metres, then

The S.I. unit of power of a lens is Dioptre. It is denoted by D.


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