Can you get glass which is opaque one side and transparent on the other side
Can you get glass which is opaque one side and transparent on the other
side
No. Definitely not. If you could, it would be a violation of
the laws of thermodynamics & you would be able to make a perpetual motion
machine.
So called ''One way Mirrors'' are glass with a semi-reflective coating. If
you stand in a darkened room, you can see through to a brightly lit
exterior, but the people outside cannot see in because of the high level of reflected light. However the glass itself is just as good passing light through one way as it is the other way. If you had glass that preferentially transmitted in one direction, you could use it to get a radiative thermal equilibrium between two warm bodies at different temperatures. This would be a violation of the zeroth law of thermodynamics that says that bodies in thermal equilibrium are at the same temperature. This in turn could be used to violate the second law of thermodynamics & allow you to convert heat at equilibrium into useful work. You would have then solved the world is energy problems & be a hero & fabulously wealthy.
Yes, if you coat it with a thin layer of metal, which will give
it semi-reflective properties. If the light on one side is stronger than
the other, people from the lighter side will see their own reflection
instead of seeing through the glass.
Input ''Window film'' into your search bar.
There are a lot of companies that produce and sell different kinds of
obscure films that allow one way vision. Most of them are varieties of
mirror film. As long as the light is stronger on the mirrored side, no-one
on that side can see through it. It is in common use in police stattions
and airports, as well as other security situations, and is not too
difficult to apply to most windows.
Yeah, they have it in airports too, to watch for smugglers, see
how people act.
Yes is that not what they use for police identification when
the witness looks through the glass and can see the identification line up
but they cant see you.
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