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A grating has a line density of 1020 cm−1, and a screen perpendicular to the ray...

A grating has a line density of 1020 cm−1, and a screen perpendicular to the ray that makes the central peak of the diffraction pattern is 2.5 m from the grating. If light of two wavelengths, 630 nm and 690 nm, passes through the grating, what is the separation on the (flat) screen between the second-order maxima for the two wavelengths?

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