The interference pattern of two identical slits separated by a distance d=0.25 mm is observed on a screen at a distance of 1 m from the plane of the slits. The slits are illuminated by monochromatic light of wavelength 589.3 nm (sodium D) travelling perpendicular to the plane of the slits. Bright bands are observed on each side of the central maxima. Calculate the separation between adjacent bright bands ?

The interference pattern of two identical slits separated by a distanc

1.	The interference pattern of two identical slits separated by a distance d=0.25 mm is observed on a screen at a distance of 1 m from the plane of the slits. The slits are illuminated by monochromatic light of wavelength 589.3 nm (sodium D) travelling perpendicular to the plane of the slits. Bright bands are observed on each side of the central maxima. Calculate the separation between adjacent bright bands ?
Answer» Solution :FRINGE WIDTH `(beta)=(Dlambda)/(d)=((1m)(589.3xx10^(-9)m))/((0.25xx10^(-3))m)` `=2XX10^(-3)m=2mm`.

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