Define power of lens. What is tha s.I.Unit of power ofa lens ? If power of lens is + 2 d what is tha nature and focal length of tha lens ?
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Answer: The reciprocal of focal length is called power of a lens. P = 1/f
Unit dioptre
P=1/ f
= 1/2
=0.5 dioptre
Nature of lens is convex
Explanation:
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Answer:
Power of lens is defined as the reciprocal of its focal length . If P is power of lens of focal length , find metres , then
P=1/f(in metres)
The S.I. unit of power of lens is Dioptre. It is denoted as D. 1 Dioptre is defined as the power of a lens of focal length 1 metre.
1D = 1m-1
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