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Asked in NEET 2016 · Intensity and coherent sources
Given: the two sources have intensities in the ratio (I₂)/(I₁)=n.
Idea: write Iₘₐₓ and Iₘᵢₙ in terms of the amplitudes √I₁ and √I₂, which add and subtract.
Iₘₐₓ=(√I₁+√I₂)² and Iₘᵢₙ=(√I₁-√I₂)².
Numerator: the difference of those two squares is 4√I₁I₂.
Denominator: their sum is 2(I₁+I₂).
Ratio =(4√I₁I₂)/(2(I₁+I₂))=(2√n)/(n+1) after dividing through by I₁.
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