A-level Physics · Diffraction gratings
Diffraction grating equation
Use d sin θ = nλ with lines per mm to find an angle, a wavelength or the lines per mm.
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Question 1
A diffraction grating has 400 lines per mm. Monochromatic light of wavelength 691 nm is incident normally on the grating. Calculate the angle between the straight-through direction and the third-order maximum, in degrees. Give your answer to 3 significant figures.
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