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Question

The Young's double slit experiment is performed with blue light and green light of wavelength 4360˙A and  5460˙A a respectively.  If X is the distance of 4th maxima, from the central one, then: 
  1. Xblue=Xgreen
  2. Xblue>Xgreen
  3. Xblue<Xgreen
  4. XblueXgreen=54604360


Solution

The correct option is C Xblue<Xgreen
Width of bands λ
λb<λg    bands become narrower as wavelength decreases. 
Xblue=4D×λbd,Xgreen=4Dλgd
XblueXgreen=λbλg=43605460,Xblue<Xgreen

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