In YDSE, when bichromatic light with wavelengths λ₁ and λ₂ is employed, the maxima resulting from both wavelengths coincide at a specific distance 'y' from the central maximum. Assuming the separation between the slits is 'd' and the distance between the screen and the slit is 'D', the expression for 'y' is given by:

y = λ₁λ₂ / (dD)