Two coherent monochromatic light beams of intensities I and 4I are superimposed. The maximum and minimum possible intensities in the resulting beam are:
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Intensity α α (Amplitude) 2
⇒ ⇒ I α α A 2
When two waves (beams) of amplitude A 1 and A 2 superimpose, at maxima and minima, the amplitude of the resulting wave are (A 1 + A 2 ) and (A 1 - A 2 ) respectively. If the maximum and minimum possible intensities are I max and I min respectively, then
I max α α (A 1 +A 2 ) 2
and I min α α (A 1 – A 2 ) 2 ⇒ ⇒ 
where 
⇒ ⇒ 
⇒ ⇒ I max = 9I, I min = I
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