The most common types of beam splitters are polarizing, non-polarizing, dichroic, cube, and plate beam splitters. Additionally, beamsplitters can be used in reverse to combine two different beams into a single one. When a light beam encounters these cubes, half of it penetrates the glass, while the other half gets reflected. However, how they work exactly often remains overlooked. They play a crucial role in various scientific, industrial, and everyday applications.