Sodium light of wavelength 589nm falls on a diffraction, Ask an Expert

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Sodium light of wavelength 589nm falls on a diffraction grating and its first-order peak on a screen 60.0cm away falls 3.32cm from the central peak. Another source produces a line 3.71cm from the zero order peak. (small angle approximation is valid in this problem) .

a) What is its wavelength?

b) How many lines per cm does the grating have?

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