This program is used to calculate the projection size of a laser beam spot on a reflective mirror after reflection at a certain angle. The calculation formula is shown below:
$$ P = \frac{w}{\cos \theta} \times \left(1 + A\right) $$
Where P represents the projection size of the beam spot on the mirror, w represents the beam spot size in space, θ represents the angle between the laser beam and the mirror surface, and A represents a user-defined additional margin factor.