alleryThe resolving power (RP) of a diffraction grating with N slits in the m-th order is:
A$RP = mN$
B$RP = m + N$ (sum)
C$RP = m / N$ (ratio)
D$RP = m^2 + N^2$
Answer & Solution
Correct answer: A. $RP = mN$
**Diffraction grating:** RP = λ / Δλ = mN (where N = number of slits illuminated, m = diffraction order).
Higher orders + more slits = sharper, better-separated spectral lines.
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