Laser Interferometer - Homemade for $20

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Create a homemade laser interferometer for as little as $20. Great for testing surface stability when crea...
Create a homemade laser interferometer for as little as $20. Great for testing surface stability when creating holograms at home. In 1907, the first optical interferometer proved that the speed of light was constant and you can also take measurements in micrometers with it. A red laser can be used.
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