How far away should the dectector be placed from the grating

Reference no: EM13305918

A diffraction grating has 1380 lines/mm. You desire to detect two sodium lines at 589.0 nm and 589.6 nm with a detector. If the lines must be separated by 45 micro meters in the third order, how far away should the dectector be placed from the grating?

Reference no: EM13305918

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