optics

Ernst Ruska and the Electron Microscope

Ernst Ruska and the Electron Microscope

On March 9, 1931, German physicist Ernst Ruska together with his doctoral advisor Max Knoll presented the very first prototype electron microscope, capable of four-hundred-power magnification; the apparatus was the first demonstration of the principles of electron microscopy. “The light microscope opened the 1st gate to microcosm. The electron microscope opened the 2nd gate to microcosm.” What will we find opening the 3rd gate? (Ernst Ruska, 1985)[1] Youth and Education Ernst Ruska…
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Sir Isaac Newton and the famous Principia

Sir Isaac Newton and the famous Principia

On July 5, 1687, Sir Isaac Newton published his Philosophiae Naturalis Principia Mathematica (in Latin). It is to be considered as the most influential work of Sir Isaac Newton and as one of the greatest scientific works of all time. The original impulse to work on the Principia gave Edmund Halley,[2,3] the English scientist known for his calculations on the orbits of comets and for being the second Astronomer Royal in Britain. In 1684,…
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Thomas Young – The Last Man who Knew Everything

Thomas Young – The Last Man who Knew Everything

On June 13, 1773, British polymath and physician Thomas Young was born. Young made notable scientific contributions to the fields of vision, light, solid mechanics, energy, physiology, language, musical harmony, and Egyptology. He “made a number of original and insightful innovations” in the decipherment of Egyptian hieroglyphs (specifically the Rosetta Stone) before Jean-François Champollion eventually expanded on his work.[1] Young came from a family of Quakers, of Milverton, Somerset, UK, and was…
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Augustin-Jean Fresnel and the Wave Theory of Light

Augustin-Jean Fresnel and the Wave Theory of Light

On March 10, 1788, French civil engineer and physicist Augustin-Jean Fresnel was born. Augustin-Jean Fresnel‘s research in optics led to the almost unanimous acceptance of the wave theory of light, excluding any remnant of Newton‘s corpuscular theory, from the late 1830s until the end of the 19th century. “It’s not observation but theory that led me to this result that experience has confirmed afterwards.” – Augustin-Jean Fresnel, explaining how he was led to…
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Joseph von Fraunhofer and the Solar Spectrum

Joseph von Fraunhofer and the Solar Spectrum

On March 6, 1787, German optician and physicist Joseph Fraunhofer – later enobled Ritter von Fraunhofer – was born. He is known for the discovery of the dark absorption lines known as Fraunhofer lines in the Sun‘s spectrum, and for making excellent optical glass and achromatic telescope objectives. Moreover, he is the name giver for the German Fraunhofer Society for the advancement of applied research. “In all my experiments I could, owing to…
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Ernst Abbe – Brilliant Engineer and Courageous Social Reformer

Ernst Abbe – Brilliant Engineer and Courageous Social Reformer

On January 23, 1840, German physicist, optometrist, entrepreneur, and social reformer Ernst Abbe was born. Together with Otto Schott and Carl Zeiss, he laid the foundation of modern optics. As a co-owner of Carl Zeiss AG, a German manufacturer of research microscopes, astronomical telescopes, planetariums and other optical systems, Abbe developed numerous optical instruments. “Whatever entrepreneurial income is received shall be returned to the public, it does not belong to those who…
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Leon Foucault demonstrating the Effect of the Earth’s Rotation

Leon Foucault demonstrating the Effect of the Earth’s Rotation

On January 3, 1851, French physicist Leon Foucault started to experiment with his eponymous pendulum, by which he was able to proof the earth‘s rotation. Actually, how can you prove that the earth is a rotating orb in an easy-to-see experiment and – of course – without spaceflight? By today, Foucault’s simple device is part of numerous natural science museums around the world. The Pendulum Ok, how does Foucault’s pendulum work? The apparatus consists…
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Thomas Wedgwood – possibly the First Photographer

Thomas Wedgwood – possibly the First Photographer

On May 14, 1771, early experimenter in the field of photography Thomas Wedgwood was born. He is the first person known to have thought of creating impermanent pictures by capturing camera images on material coated with a light-sensitive chemical. His practical experiments yielded only shadow image photograms that were not light-fast, but his conceptual breakthrough and partial success have led some historians to call him “the first photographer”. Thomas Wedgwood was born…
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Joseph Jackson Lister – Perfecting the Optical Microscope

Joseph Jackson Lister – Perfecting the Optical Microscope

On January 11, 1786, British amateur opticist and physicist Joseph Jackson Lister was born. In 1826, Lister designed possibly the most important optical microscope ever made. It used an achromatic objective lens corrected for chromatic and spherical aberrations, the resulting image was at the time the clearest produced by any microscope. Family Background Joseph Jackson Lister was the son of a London wine merchant and Quaker. He attended school until 1800 and was then apprenticed to his father’s wine business…
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The James Lick Telescope

The James Lick Telescope

On January 3, 1888, the James Lick Telescope saw first light at the Lick observatory, San Jose, USA. The Lick telescope is a refracting telescope with a lens 91 cm in diameter – a major achievement in its day and in its time the largest telescope in the world until 1897. The instrument remains in operation and public viewing is allowed on a limited basis. A lot of astronomical discoveries have been made…
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