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NEET 2014 (AIPMT) · Diffraction at a Single Slit

Diffraction at a Single Slit question from NEET 2014 (AIPMT)

Q82NEET 2014 · AIPMTEasy

Diffraction at a Single Slit

A beam of light of λ=600\lambda = 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is

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Answer: (d)

  1. Distance between first dark fringes on either side: W=2DλaW = \dfrac{2D\lambda}{a}.
  2. W=2×2×600×10−91×10−3=2.4×10−3 mW = \dfrac{2 \times 2 \times 600\times10^{-9}}{1\times10^{-3}} = 2.4\times10^{-3}\text{ m}
  3. So the answer is (d) 2.4 mm2.4\text{ mm}.
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