Question: Light falling normally on a 9700-line/cm grating is revealed to contain three lines in the first order spectrum at angles of 31.2o, 36.4o, and 47.5o.

Light falling normally on a 9700-line/cm grating is revealed to contain three lines in the first –order spectrum at angles of 31.2o, 36.4o, and 47.5o. What wavelengths are these?

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