Question: Two first-order spectrum lines are measured by a 9500-line/cm spectroscope at angles, on each side of center, of + 26o38`, + 41o08` and 26o48`, 41o19`

Two first-order spectrum lines are measured by a 9500-line/cm spectroscope at angles, on each side of center, of + 26o38`, + 41o08` and –26o48`, –41o19` what are the wavelength?

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