A diffraction grating with $N$ lines per metre is used to diffract light of various wavelengths $\lambda$.
The graph shows the relation between the diffraction angle $\theta$ and $\lambda$ for different wavelengths in the $n$th order interference pattern.
What is the gradient of the graph?
$Nn$
2 )
$\frac{N}{n}$
3 )
$\frac{n}{N}$
4 )
$\frac{1}{Nn}$
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