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Pellicle mirror
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<p>A pellicle mirror is an ultra-thin, ultra-lightweight <a href="/facts/Transparency_(optics)/PRryNNW6">semi-transparent</a> mirror employed in the light path of an optical instrument, splitting the light beam into two separate beams, both of reduced light intensity. Splitting the beam allows its use for multiple purposes simultaneously. The thinness of the mirror practically eliminates beam or image doubling due to a non-coincident weak second reflection from the nominally non-reflecting surface, a problem with mirror-type <a href="/facts/Beam_splitter/3PFoofER">beam splitters</a>. The name <i>pellicle</i> is a diminutive of <i>pellis</i>, a skin or film. </p>