A grating 1 600 cm wide has exactly 12 000 slits The grating is used to resolve two nearly equal wavelengths in a light source a 440 000 nm and b 440 936 nm (a) How many orders of the lines can be seen with the grating (b) What is the angular separation b a between the lines in each order (c) Which order best resolves the two lines Explain

Question: A grating 1.600 cm wide has exactly 12 000 slits. The grating is used to resolve two nearly equal wavelengths in a light source: a

A grating 1.600 cm wide has exactly 12 000 slits. The grating is used to resolve two nearly equal wavelengths in a light source: λa = 440.000 nm and λb = 440.936 nm.
(a) How many orders of the lines can be seen with the grating?
(b) What is the angular separation θb - θa between the lines in each order?
(c) Which order best resolves the two lines? Explain.

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