Problem 6: Light is incident normally on a grating which has 250 lines/mm. Find the wavelength of the spectral line for which the deviation in second order is 12o.
No of lines = 250/mm = 250000/m,
Order of deviation = m = 2
Separation between lines = d = 1/250000,
Angle of deviation = θ = 12o
Wavelength = λ =?
Put the values,
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