What is the least separation between wavelengths that can be resolved near 640 nm in the second order, using a diffraction grating that is 5 cm wide and ruled with 32 lines per millimetre?

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What is the least separation between wavelengths that can be resolved near 640 nm in the second order, using a diffraction grating that is 5 cm wide and ruled with 32 lines per millimetre?

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