# Derivations – What’s Acceptable?

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

Hello,

this isn’t really a h/w problem that fits the template, but here seems the most sensible place to post.

I am writing a paper (not original research) and part of the requirements is that I include a "comprehensive discussion of the relevant theory (including derivations of equations)". The experiment I will be writing about makes use of the lens makers formula. I know how to derive this but the derivation makes use of the equation [itex]\frac{n_{1}}{p} + \frac{n_{2}}{q} = \frac{n_{2} – n_{1}}{R}[/itex].

This equation in turn relies upon snell’s law, which I can derive from fermat’s principle.

My question is this;

If the experiment doesn’t make use of the other equations, is it necessary to show their derivations, or is it acceptable to merely reference them?

I don’t want to make it sound like i’m hoping you’ll say ‘just reference them’ – I would actually like to show my lab instructor that I can derive it from first principles but I am worried that it might be viewed as unnecessary/an attempt to boost the word count etc.

What do you think?

http://ift.tt/1nY6UnY

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