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1. The problem statement, all variables and given/known data

A particular grating has slits of width 600nm and a slit separation of 1800nm. Will there be any missing orders if this is used to observe a line spectrum consisting of 450nm, 600nm and 650nm?

2. Relevant equations

I'm not sure what formula to use but think it may be either

n=d sin theta/lamda or

a sin theta/n lamda

3. The attempt at a solution

As I'm not sure even what equation to use I'm not going to attemp it. Can someone just tell me what equation I need in order to answer the question. I'm sure I could figure it out if I just know what the equation is.

Thanks

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# Diffraction of light and orders equation?

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