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Reference.org
Beam splitter
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<p>A beam splitter or beamsplitter is an <a href="/facts/Optical_instrument/jB29DQNk">optical device</a> that splits a beam of <a href="/facts/Light/jeofpMn4">light</a> into a transmitted and a reflected beam. It is a crucial part of many optical experimental and measurement systems, such as <a href="/facts/Interferometry/X3E1SsQT">interferometers</a>, also finding widespread application in <a href="/facts/Fibre_optic/5ruuIFbj">fibre optic</a> <a href="/facts/Telecommunications/vxoj1cxR">telecommunications</a>. </p>