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A grating has 1050 lines per centimetre, and a
flat screen is perpendicular to the ray that
makes the central peak of the diffraction
pattern. The screen is 2.45 m from the grating.
If light of two wavelengths, 600 nm and 690
nm, passes through the grating, what is the
separation on the screen between the third-
order maxima for the two wavelengths?

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