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CBSE Class 12-science Answered

Why we multiply 100 when we converting the power of a lens into the focal length
Asked by modi72879 | 26 Feb, 2018, 12:45: AM
answered-by-expert Expert Answer
Power of a lens of focal length f is defined as 1/f , where f is expressed in metre. Unit of power of lens is Diopter (D)
Example:- let us assume the focal length of convex lens is 40 cm.
Then Power = 100/40 = +2.5 D
we multiply 1/40 by 100 in the above example, because we are converting the focal length used in the denominator from centimetre to metre.
Answered by Thiyagarajan K | 26 Feb, 2018, 07:53: AM

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