n identical light waves each of intensity I₀ are superposed in a homogenous medium. The resultant maximum intensity in their incoherent and coherent addition are respectively.

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$Zero and n^{2} I_{0}$

${nI}_{0} and n^{2} I_{0}$

nI and zero

$n^{2} I_{0} and n^{2} I_{0}$

answer is B.

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Detailed Solution

1. In incoherent addition the intensities are added algebraically $I_{Net} = I_{1} + I_{2} + I_{3} + \dots . . I_{n}$
2. In coherent addition the net intensity observed is $I_{Net} = {(\sqrt{I_{1}} + \sqrt{I_{2}} + \dots . \sqrt{I_{n}})}^{2}$

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