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Question: Answered & Verified by Expert
The sodium yellow doublet has wavelengths 5890 Å and λ Å and resolving power of a grating to resolve these lines is 982, then value of λ is
PhysicsWave OpticsNEET
Options:
  • A 5896 Å
  • B 5880 Å
  • C 5869 Å
  • D 5876 Å
Solution:
2598 Upvotes Verified Answer
The correct answer is: 5896 Å
Mean wavelength λm=5890+λ2

Wavelength difference dλ=λ-5890

Resolving power R of a grating

R=λmdλ=5890+λ2λ-5890=982

λ=5896 Å

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