Bright fringes are formed at:

$\overline{){\mathbf{d}}{\mathbf{s}}{\mathbf{i}}{\mathbf{n}}{\mathbf{\theta}}{\mathbf{=}}{\mathbf{m}}{\mathbf{\lambda}}}$ d is the slit width and m is the order.

d = 1/N

N = 500 lines/mm(1000mm/1m) = 5 × 10^{5} lines/m

The maximum number of orders occurs when θ = 90, sin90 = 1.

A 500 lines per mm diffraction grating is illuminated by light of wavelength 510 nm.

How many diffraction orders are seen?

m_{max}= __________

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