- Cars side mirror helps driver to check approaching cars from behind before switching lanes. Is also useful when reversing a car
- Dentist uses small mirror to examine condition of inner surfaces of patients teeth
- Teleprompter → 2 way mirror → both for transmitting and reflecting light.
- allows light to reach recording devices (green arrow) .
- also reflects words from news script at the same time (black arrow)
- presenter is able to read news on the 2 way mirror and maintain eye contact with the video camera
