compound microscope

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compound microscope

17th-century compound microscope

Labeled diagram of a simple optical microscope showing main parts including eyepiece, body tube, objective turret, objectives, stage with specimen slide, condenser, lamp, base, arm, coarse and fine focusing knobs, with an eye looking through the eyepiece.

compound microscope

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June 23, 2026

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compound microscope — compound microscope A compound microscope.

A compound microscope uses two lens arrays to achieve higher magnification than a simple microscope. The objective lens, placed close to the specimen, forms an initial image. This image is then magnified by the eyepiece for the observer to see. The total magnification is the product of the objective and eyepiece magnifications.123

Key components include a body tube to hold the lenses, a condenser lens to focus light on the specimen, and an illumination system. Focusing is achieved through coarse and fine controls. Compound microscopes can be monocular (one eyepiece) or binocular (two eyepieces) for increased comfort. The resolution, or the ability to distinguish fine details, is limited by the wavelength of light and the numerical aperture of the objective lens. Early compound microscopes were developed around 1590 by Dutch spectacle makers.12435

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microscope
The compound microscope
The limitations on resolution (and therefore magnifying power) imposed by the constraints of a simple microscope can be overcome by the use of a compound microscope, in which the image is relayed by two lens arrays. One of them, the objective, has…
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The limitations on resolution (and therefore magnifying power) imposed by the constraints of a simple microscope can be overcome by the use of a compound microscope, in which the image is relayed by two lens arrays. One of them, the objective, has…
Read More

diagnosis
Historical aspects
…was the invention of the compound microscope toward the end of the 16th century by the Dutch optician Hans Jansen and his son Zacharias. In the early 17th century, Italian philosopher, astronomer, and mathematician Galileo constructed a microscope and a telescope. The utility of microscopes in the biological sciences and…
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…was the invention of the compound microscope toward the end of the 16th century by the Dutch optician Hans Jansen and his son Zacharias. In the early 17th century, Italian philosopher, astronomer, and mathematician Galileo constructed a microscope and a telescope. The utility of microscopes in the biological sciences and…
Read More

microscope
History of optical microscopes
…received credit for inventing the compound microscope about 1590. The first portrayal of a microscope was drawn about 1631 in the Netherlands. It was clearly of a compound microscope, with an eyepiece and an objective lens. This kind of instrument, which came to be made of wood and cardboard, often…
Read More
…received credit for inventing the compound microscope about 1590. The first portrayal of a microscope was drawn about 1631 in the Netherlands. It was clearly of a compound microscope, with an eyepiece and an objective lens. This kind of instrument, which came to be made of wood and cardboard, often…
Read More

microbiology
Morphology
…of the 20th century, the compound light microscope was the instrument commonly used in microbiology. Light microscopes have a usual magnification factor of 1000 × and a maximum useful magnification of approximately 2000 ×. Specimens can be observed either after they have been stained by one of several techniques to…
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…of the 20th century, the compound light microscope was the instrument commonly used in microbiology. Light microscopes have a usual magnification factor of 1000 × and a maximum useful magnification of approximately 2000 ×. Specimens can be observed either after they have been stained by one of several techniques to…
Read More