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MHT CET 2021 (21 Sep, Shift 2) · YDSE: Fringe Width & Fringe Positions

YDSE: Fringe Width & Fringe Positions question from MHT CET 2021 (21 Sep, Shift 2)

Q54MHT CET 2021 · 21 SEP · SHIFT 2Easy

YDSE: Fringe Width & Fringe Positions

Two coherent sources 'P' and 'Q' produce interference at point 'A' on the screen, where there is a dark band which is formed between 4th and 5th bright band. Wavelength of light used is 6000 A˚\text{Å}. The path difference PA and QA is

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Answer: (d)

  1. The dark band between the 4th and 5th bright bands is the 5th dark band.
  2. Path difference =(2n−1)λ2=4.5λ= \frac{(2n-1)\lambda}{2} = 4.5\lambda
  3. 4.5×6000×10−8 cm=2.7×10−4 cm4.5 \times 6000\times10^{-8}\text{ cm} = 2.7\times10^{-4}\text{ cm}
  4. So the answer is (d) 2.7×10−42.7\times10^{-4} cm.
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