![]() ![]() Light intensity decreases with distance from source to receiving surface (sink), and the rate of decrease is in proportion to the square of the distance between emitter and receiver. Does light intensity decrease with distance? Since light is also an electromagnetic wave, the intensity of light will depend upon the amplitude of the wave. This means, that if you have two beams with equal intensities, the area is the same and the power has to be the same as well.ĭoes light intensity depend on frequency?Īccording to the electromagnetic theory, the intensity of a wave is directly proportional to its amplitude, i.e., I ∝ A 2. The light intensity I is the power P, that irradiates an area A, I=P/A, therefore the units Wm−2.
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