What is the difference between a one way mirror and a two way mirror?
They are two different terms for the same thing. A “one way” mirror is technically just a regular mirror. Many people often use the term when they really mean “two way” mirror. A one way mirror only reflects light one way–back at the viewer. A two way mirror is a mirror you can see through. In other words, light strikes the surface and goes two ways: back at you and towards the observer on the other side.