Resolving power of diffraction grating with N lines:
AIndependent of N
B1
CN²
DNm (where m = order of diffraction) — Rayleigh criterion
Answer & Solution
Correct answer: D. Nm (where m = order of diffraction) — Rayleigh criterion
R = λ/Δλ = Nm. More lines (or higher order) means finer resolution. Used in spectrometers to separate close spectral lines (e.g., sodium D-line doublet).
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