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NEET 1990 (AIPMT) · YDSE: Fringe Width & Fringe Positions

YDSE: Fringe Width & Fringe Positions question from NEET 1990 (AIPMT)

Q78NEET 1990 · AIPMTEasy

YDSE: Fringe Width & Fringe Positions

The Young's double slit experiment is performed with blue and with green light of wavelengths 4360 Å and 5460 Å respectively. If xx is the distance of 4th maxima from the central one, then

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Answer: (c)

  1. xn=nλDdx_n = \frac{n\lambda D}{d}, so for the same nn, DD, dd: x∝λx \propto \lambda
  2. λblue=4360\lambda_{\text{blue}} = 4360 Å <λgreen=5460< \lambda_{\text{green}} = 5460 Å
  3. So the answer is (c) x(blue)<x(green)x(\text{blue}) < x(\text{green}).
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