(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

http://i.imgur.com/xrba7.png

2. Relevant equations

I'm using this equation to find the thickness of the polymer.

[(m+(1/2)) λ = 2nt] (where "n" is the index of refraction and "t" is the thickness )

3. The attempt at a solution

I just want to know how m is determined. I've learned everything else, but I missed the first day on which m value to use and it's always jsut slipped my mind whenever I'm in class or lab.

Thank you for your time.

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# Homework Help: How to determine M (Waves)

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