The amplitude of light depends upon the distance of the point from the axis of a cylindrical source as follows :

Question

suresh kumar · Answer

the example of cylindrical source is the line of light. it emits cylindrical expanding wave fronts. intensity I = P / area , P is the power of source which is constant Hence I ∝ 1 / area area of cylinder , a = 2 π r h , (h=height of cylinder) , therefore intensity of wave , I ∝ 1 / 2 π r h , which implies I ∝ 1 / r we have , I ∝ A 2 ( A = amplitude) we get , A 2 ∝ 1 / r , A ∝ 1 / sqt(r) Hence, last option is correct

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The amplitude of light depends upon the distance of the point from the axis of a cylindrical source as follows :

The amplitude of light depends upon the distance of the point from the axis of a cylindrical source as follows :

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