AT FIRST, it looks like an ordinary mirror. But it's not. It is "half-silvered". Half of the light that hits it is reflected. The other half passes straight through.This is not in itself extraordinary. Any time you look out of a window and see the room you are sitting in partially reflected, you're seeing a similar effect. Special beam-splitting mirrors are part of any teleprompter, and you can buy them online without breaking the bank if you really want to.
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