The main functionality of a prism is to change the light path of a particular light source or the orientation of an image.

As such, it is mainly employed in optical and imaging instruments to shorten light paths through multiple internal reflections. Hence, if you are depending on numerous lens to

1. bend, change or diverge a light path, or to
2. invert/ revert images,

then it is possible to simplify and miniture your current system setup by looking through various options that offer in this section.