Funhouse mirrors make people look different by tilting or curving different areas of the mirror. This changes the angle at which light hits the mirror and your eyes, which makes the image seem distorted in comparison to a normal mirror, according to the Annenberg Learner.
Funhouse mirrors are usually convex or concave. A mirror that is convex makes a person look shorter, while a mirror that is concave makes a person look taller. It is also possible to have a mirror that is not simply convex or concave, but convex in some areas and concave in other areas. This means that from the side the mirror would not appear in an arch, like convex or concave mirrors, but instead in waves.
There are three points that are important to consider when talking about the physics of mirrors. One is the normal line, which is a line drawn perpendicular to the mirror. Around the normal line, there is an angle of incidence, where light hits the mirror, and an angle of reflection, where your eyes see the light that has hit the mirror. Funhouse mirrors work by changing the point at which a perpendicular line can be drawn on the mirror. This changes the angle at which light can be reflected onto the mirror and onto the eyes, distorting the image that is seen.