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**1. The problem statement**

A diffraction grating has a slit separation of 2094.0 nm. What is the dispersion of the 2nd order lines at an angle of 30 degrees (in degrees per micrometer)?

## Homework Equations

dsinΘ=mλ

y=(mDλ)/d

**3. Attempt at a solution**

I began by finding λ using the first equation, so...

2λ=.002094(sin(.30))

λ=.00000548205

Note: I changed d from nm to mm before I began any calculations

We haven't gone over this in class yet, so I'm confused on where to go from here. I believe it has something to do with the second equation listed above, but I don't know what variable represents the dispersion or if these are really even the equations I need. I would like some guidance as for what steps to take next or what equations I should be using- I think just a push in the right direction could help immensely.