Two way mirror on the side where you can see through it

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In summary, the conversation discusses the concept of a two-way mirror and how light behaves when it reflects off of it. Depending on the type of two-way mirror, an observer may either see nothing or a dim reflection of themselves when looking through it. The addition of a regular mirror in the subject room may also affect what the observer sees.
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x G r E e D
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Lets say you are looking through a two way mirror on the side where you can see through it, and there is a mirror on the other side. What would you see? So there is two mirrors back to back and you can see through one of them. So when the light bounces off the first mirror and trys to go back through to where you are, and it theoreticaly can't because its only a two way mirror.
 
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Why can't the light reflected from the first (regular) mirror pass through the two way mirror? (It wouldn't be of much use if light couldn't pass through it!)
 
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Wouldn't you see your own reflection?
 
  • #4


x G r E e D said:
Lets say you are looking through a two way mirror on the side where you can see through it, and there is a mirror on the other side. What would you see? So there is two mirrors back to back and you can see through one of them. So when the light bounces off the first mirror and trys to go back through to where you are, and it theoreticaly can't because its only a two way mirror.
Assuming an ideal one-way mirror (perfectly transparent one direction and perfectly reflective the other so that light only goes one way, towards you), then you would see nothing.

Assuming a real one-way mirror (partially transparent and partially reflective both ways), then you would see a dim reflection of yourself.
 
  • #5


calvinuk said:
Wouldn't you see your own reflection?
No because light can't pass through the mirror that you are looking through towards you. If you were on the other side yourself. Think of it as if you were at a police station in an interogation room where you are the cop looking at the suspect, and he can't see you. Put a mirror where the suspect is and then what will see. Probably nothing since the light can't pass through it. Therefore you see a cancelation of light waves making it black.
 
  • #6


x G r E e D said:
No because light can't pass through the mirror that you are looking through towards you. If you were on the other side yourself. Think of it as if you were at a police station in an interogation room where you are the cop looking at the suspect, and he can't see you.
It's still not clear to me what you are asking about. There are two sides/rooms to the 2-way mirror setup:
-The subject side (this is where the subject or suspect is placed; this room is kept brightly lit);
-The observer side (this is where an observer would sit; this room is kept dim)
Put a mirror where the suspect is and then what will see.
You added a regular mirror to the subject room, I presume. What will who see? Who's looking at that mirror? The suspect? The observer?
Probably nothing since the light can't pass through it. Therefore you see a cancelation of light waves making it black.
The observer viewing things from behind the 2-way mirror sees the light from within the subject room (a portion of that light is transmitted through the 2-way mirror). So he sees whatever's in the room reflected off the regular mirror.

Since a bit of light from the observation room is transmitted through the 2-way mirror into the subject room (hopefully not noticed by anyone in there!), the observer might be able to see a dim reflection of himself in the regular mirror, as DaleSpam noted.
 

1. How does a two way mirror work?

A two way mirror, also known as a one-way mirror, is a type of glass that is partially reflective and partially transparent. This is achieved by applying a thin layer of reflective material, such as aluminum, to one side of the glass. When the room on one side is brighter than the other, the reflective side will appear as a mirror, while the transparent side will allow you to see through to the other room.

2. Can you see through a two way mirror from both sides?

No, you cannot see through a two way mirror from both sides simultaneously. The side that appears as a mirror will always be the side with the brighter lighting, while the other side will remain transparent.

3. How do I know if a mirror is two way?

One way to test if a mirror is two way is to place your finger against the surface. If there is a slight gap between your finger and its reflection, it is likely a two way mirror. You can also try shining a light at the mirror - if it is two way, the light will pass through and illuminate the other side.

4. What are some common uses for two way mirrors?

Two way mirrors are commonly used in interrogation rooms, observation rooms, and security systems. They are also used in theaters and television studios to create an illusion of depth on stage. In everyday life, two way mirrors can be found in some dressing rooms and public bathrooms.

5. Are two way mirrors also used in surveillance?

Yes, two way mirrors can be used in surveillance systems to monitor activities without being detected. The reflective side of the mirror allows the observer to remain hidden while still being able to see what is happening on the other side. However, the use of two way mirrors in surveillance is controversial and may be restricted by laws in some areas.

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