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In YDSE experiment slits are illuminated by light of consisting two wavelengths λ1=600 nm and λ2= 400 nm. Slit separation is 0.5 mm and screen is 2 m away from slits. Separation between 2nd order minima of two wavelengths in mm is  (Write upto two digits after the decimal point.)


Solution

Position of minima is y=(2n1)λD2d
For 2nd minima y2=3λD2dy2'=3λ'D2dΔy=3D2d(λ'λ)=3×2×(600400)×1092×0.5×103=1.2×103 m=1.20 mm

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