In young's double slit experiment the two slits 0.15mm apart are illuminated by monochromatic light of wavelength 450nm. The screen is 1m away from the slits. Find the distance of the second

a) bright fringe

b) dark fringe from central maximum

Given :d = 0.15 mm λ=450 nmD = 1mFor Bright Fringes :x=nλD d (i) For second bright fringe:x=2×450×10-9×10.15×10-3  =6000 ×10-6m= 6 mm(ii) For Dark Fringes :x =2n-1λD 2d For first dark fringe , n =1x=450×10-9×12×0.15×10-3=1500×10-6m=1.5 mm

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