# Consider two coherent monochromatic (wavelength lambda) sources S_(1) and S_(2) separated by a distance d. The ratio of intensity of S_(1) and t

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Consider two coherent monochromatic (wavelength lambda) sources S_(1) and S_(2) separated by a distance d. The ratio of intensity of S_(1) and that of S_(2) at point P is 4. The distance of P from S_(1) if the resultant intensity at point P is equal to (9)/(4), times the intensity due to S_(1) is : (n is a positive integer )

A. (d^(2)-n^(2)lambda^(2))/(2nlambda)
B. (d^(2)+n^(2)lambda^(2))/(2nlambda)
C. (n lambdad)/(sqrt(d^(2)-n^(2)lambda^(2))
D. (2n lambdad)/(sqrt(d^(2)-n^(2)lambda^(2))

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