deletions | additions       diff --git a/Theory.tex b/Theory.tex  index 23caac3..a378f59 100644  --- a/Theory.tex  +++ b/Theory.tex 
...
where $FN$ is the Fresnel number, $x$ is the distance along the detector, $z$ is the distance between the sample and the detector, and $\lambda$ is the wavelength. To get a far-field diffraction patter, $FN << 1$ [4].\\  To find the find the focal point of ours lens and the proper placement of our sample and detector, we use the equation  \[ \frac{1}{f_{o}}=\frac{1}{d_{o}}+\frac{1}{d_{1}} \frac{1}{f_{0}}=\frac{1}{d_{0}}+\frac{1}{d_{1}}  \] where $f_{0}$ is the focal length of the particular lens, and $d_{0}$ and $d_{1}$ are the distances of the sample and the detector relative to the lens [2]. \textbold{To be continued with fourier stuff as well as Equally sloped tomography}