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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 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 constantHence I∝1/areaarea of cylinder , a=2πrh , (h=height of cylinder) ,therefore intensity of wave , I∝1/2πrh ,which implies I∝1/r we have , I∝A2 (A= amplitude) we get , A2 ∝1/r , A∝1/sqt(r)Hence, last option is correct
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