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Bernard of Gordon, a physician, he mentioned the use of spectacles as a way of correcting long-sightedness.
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Theodoric (Dietrich) of Freiberg. Theodoric explained the rainbow as a consequence of refraction and internal reflection within individual raindrops. He gave an explanation for the appearance of a primary and secondary bow but, following earlier notions, he considered colour to arise from a combination of darkness and brightness in different proportions.
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Zacharius Jensen (Netherlands). Constructed a compound microscope with a converging objective lens and a diverging eye lens
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Kepler suggested that the intensity of light from a point source varies greatly with the square of the distance from the source, that light can be moved over an unlimited distance and that the speed of movement is infinite. He explained vision as a consequence of the formation of an image on the retina by the lens in the eye and correctly described the causes of long-sightedness and short-sightedness.
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Constructed a telescope with a converging objective lens and a diverging eye lens.
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Constructed his own version of Lippershey's telescope and started to use it for astronomical observations.
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Newton put forward his view that light is corpuscular but that the corpuscles are able to excite waves in the aether. His adherence to a corpuscular nature of light was based primarily on the presumption that light travels in straight lines whereas waves can bend into the region of shadow.
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As a result of observing light reflected from the windows of the Palais Luxembourg in Paris through a calcite crystal as it is rotated, Malus discovered an effect that later led to the conclusion that light can be polarized by reflection.
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gave the world's first public demonstration of a working television system that transmitted live moving images with tone graduation (grayscale) on 26 January 1926 at his laboratory in London.
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Performed a series of experiments to determine the speed of light using a rotating mirror method with a light path from the observatory at Mount Wilson to a reflector on Mount San Antonio, a distance of 22 miles (35 km). Obtained an average value of 299,796 km/s.
