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Young's double slit Experiment

In Young's double slit experiment the separation d between the slits is 2 mm the wavelength λ of the light used is 5896 Ao and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20o. To increase the fringe angular width to 0.21o (with same λ and D) the separation between the slits needs to be changed to


 Angular width =λd

0.20°=λ2 mm   ...(i  0.21°=λd     ....(ii)

 Dividing we get, 0.200.21=d2 mm

  d=1.9 mm

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