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**Diffraction of light and orders equation??**

## Homework Statement

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?

## Homework 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

## 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