Bright fringes are formed at:
d is the slit width and m is the order.
d = 1/N
N = 500 lines/mm(1000mm/1m) = 5 × 105 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?
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