When a person as a shower why does a heated mirror not become misty but stays clear why?

A heated mirror stays clear during a shower because it is kept at a temperature that prevents condensation from forming on its surface. When warm, moist air from the shower comes into contact with the cooler surface of a regular mirror, it cools down and condenses into water droplets, creating mist. However, the heated mirror maintains a temperature above the dew point of the humid air, preventing moisture from condensing and allowing it to remain clear.