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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.

Solution

Given Data

No of lines = 250/mm = 250000/m,
Order of deviation = m = 2

Separation between lines = d = 1/250000,
  Angle of deviation = θ = 12o

Required

Wavelength = λ =?

Formula

 

Put the values,

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