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A Lieberkühn mirror from Emil Busch AG (now Rathenower Optische Werke) circa 1930, digital collection of the Deutsches Museum. [1]A Lieberkühn reflector [2] (also known as Lieberkühn mirror [3] or simply Lieberkühn [2] [4]) is an illumination device for incident light illumination (epi-illumination) in light microscopes.
It is named after Paul Kirkpatrick and Albert Baez, the inventors of the X-ray microscope. [1] Although X-rays can be focused by compound refractive lenses, these also reduce the intensity of the beam and are therefore undesirable. KB mirrors, on the other hand, can focus beams to small spot sizes with minimal loss of intensity.
A concave mirror, or converging mirror, has a reflecting surface that is recessed inward (away from the incident light). Concave mirrors reflect light inward to one focal point. They are used to focus light. Unlike convex mirrors, concave mirrors show different image types depending on the distance between the object and the mirror.
Antonie van Leeuwenhoek (1632–1723). The field of microscopy (optical microscopy) dates back to at least the 17th-century.Earlier microscopes, single lens magnifying glasses with limited magnification, date at least as far back as the wide spread use of lenses in eyeglasses in the 13th century [2] but more advanced compound microscopes first appeared in Europe around 1620 [3] [4] The ...
A catadioptric optical system is one where refraction and reflection are combined in an optical system, usually via lenses and curved mirrors . Catadioptric combinations are used in focusing systems such as searchlights, headlamps, early lighthouse focusing systems, optical telescopes, microscopes, and telephoto lenses.
The dielectric mirror is made of transparent materials that are uniformly layered at a depth of 1/4 the wavelength of light the dielectric mirror is designed to reflect. In addition, the amplitude reflection coefficients for the interfaces have alternating signs, hence all reflected components from the interfaces interfere constructively, which ...
Two Leica oil immersion microscope objective lenses; left 100×, right 40×. The objective lens of a microscope is the one at the bottom near the sample. At its simplest, it is a very high-powered magnifying glass, with very short focal length. This is brought very close to the specimen being examined so that the light from the specimen comes ...
Lloyd's mirror is an optics experiment that was first described in 1834 by Humphrey Lloyd in the Transactions of the Royal Irish Academy. [1] Its original goal was to provide further evidence for the wave nature of light , beyond those provided by Thomas Young and Augustin-Jean Fresnel .