A grating is used to resolve the sodium D lines (589.0nm and 589.6nm) in the first order. How many rulings (slits) are needed?

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A grating is used to resolve the sodium D lines (589.0nm and 589.6nm) in the first order. How
many rulings (slits) are needed?
If the focal length of the focusing lens is 20cm, and the total width of the grating is 2cm, what is
the linear separation at the focal plane between the two D lines?
Transcribed Image Text:A grating is used to resolve the sodium D lines (589.0nm and 589.6nm) in the first order. How many rulings (slits) are needed? If the focal length of the focusing lens is 20cm, and the total width of the grating is 2cm, what is the linear separation at the focal plane between the two D lines?
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