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## Homework Statement

find the angular separation between the red hydrogen-alpha spectral line at 656nm and the yellow sodium line at 589nm if the two are observed in third order with a 3500-line/cm grating spectrometer.

## Homework Equations

maximum equation for multi-slit interference

d sin(theta)=m*lamda

d=distance between two slits

m=the interger called the order (bright spots)

theta=angular seperation

lamda=wavelength

## The Attempt at a Solution

I tried plugging all of my data into the equation above with d as 1/grading but I'm not sure if this is the right way to go about the problem. I'm not even sure if this is the best formula to use but I cant find any other relevant equations