Why is there light coming from the beam splitter
So there is always part of light that goes directly through without changing the direction. A beam splitter or beamsplitter is an optical device that splits a beam of light into a transmitted and a reflected beam. It is a crucial part of many optical experimental and measurement systems, such as interferometers, also finding widespread application in fibre optic telecommunications. When a beam of light encounters the beam splitter, a portion of the light is reflected, while the remaining portion is transmitted.
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