One classic set you’ll see in most vintage mystery movies is an interrogation room with a “two-way” mirror in one wall. This cool gadget lets the witnesses see the suspects from another room while the ...

There are many uses for two-way mirrors besides interrogation rooms, including teleprompters, scientific and marketing research, security cameras, and to create various stage effects.

The two-way mirror in Harry Potter wasn't fully explained in the movies, creating confusion among viewers. The mirror functions as a communication tool and plays a significant role in Harry's ...

Recently (5/21/25), I published a Design Idea (DI) describing a bidirectional current mirror using just two transistors and a diode, “ A two-way mirror—current mirror that is.” That circuit works well ...