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Which of the following is the correct expression for the ratio of the intensity of principal maxima to the intensity of secondary maxima?

Which of the following is the correct expression for the ratio of the intensity of principal maxima to the intensity of secondary maxima? Correct Answer 1 + (N2-1) sin2β

The expression 1 + (N2-1) sin2β is the relation for the ratio of the intensity of principal maxima to that of the secondary maxima. It shows that the intensity of secondary maximas are inversely proportional to N.

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