This is a draft-like code, which arose from a friend's request to try to estimate the focal point of a beam of light after hitting 3 mirrors.
In the code one may create the 3 different mirrors, the initial position and aperture of the beam, hence, by visualization, one is able to fine-tune the mirror's positions, given the beam's characteristics, in order to create and estimate a focal point.
This is depicted in the figure above.