Lieberkühn reflector

A Lieberkühn reflector (also known as Lieberkühn mirror or simply Lieberkühn) is an illumination device for incident light illumination (epi-illumination) in light microscopes. It encircles the objective, with the mirrored surface facing towards the specimen. This allows illuminating an opaque object from the side of the objective, with the light source positioned behind the specimen as in a transmission microscope.

The device is named after Johann Nathanael Lieberkühn (1711–1756) who used and popularized it but did not invent it. Similar mirrors were described and used by earlier microscopists.

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