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NEETPhysicsCurrent Electricity

Following diffraction pattern was obtained using a diffraction grating using two different wavelengths ₁ and ₂ . With the help of the figure identify which is the longer wavelength and their ratios.

Options

  1. A₂ is longer than ₁ and the ratio of the longer to the shorter wavelength is 1.5
  2. B₁ is longer than ₂ and the ratio of the longer to the shorter wavelength is 1.5
  3. C₁ and ₂ are equal and their ratio is 1.0
  4. D₂ is longer than ₁ and the ratio of the longer to the shorter wavelength is 2.5 .

Correct answer

C. ₁ and ₂ are equal and their ratio is 1.0

Step-by-step solution

Since position of central maximum is same, hence asin = is same for both wavelengths. i.e, a= constant, = same, is same for both waves ₁= ₂ and ₁ ₂ =1

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