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Download Diffraction : coherence in optics by M Françon PDF

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By M Françon

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Building on this initial endeavor, in the early twentieth century the Danish physician Niels Ryberg Finsen (1860–1904) received a Nobel Prize for his work on the treatment of smallpox with light. Accurate descriptions of optical eye examinations and treatment options with optical means date back to at least 1830 in the book Treatise on Diseases of the Eye, from the work of the English ophthalmologist Dr. William Mackenzie (1791–1868). Most physicians had been aware of eye tumors for centuries and used scalpels to remove the cancerous growth, often damaging the eye.

Foucault made his assesment of the speed of light with a rotating mirror. 99796 × 108 m/s in air. In 1879 the American scientist of Polish origin Albert Abraham Michelson (1852–1931) improved on Foucault’s measurements. 9991 × 108 m/s. 99796×108 m/s. Other measurements were done in both the radio and light waves in the past decades. 99792458×108 m/s. On another front there were developments in the optics of the eye. In 1850 the German scientist Hermann Ludwig Ferdinand von Helmholtz (1821–1894) presented his ideas for an ophthalmoscope during a presentation to the Physical Society of Berlin, and in 1856 he published his findings on eye accommodation by reshaping the lens in his Handbuch der Physiologischen Optik.

10. 99792458 × 108 m/s: a. How far does light propagate in a nanosecond? b. How far in a light year? 11. How does the theory of ray optics described by Aristotle compare to the postulates made by Willebrord Snell in 1621? a. Who else proposed similar concepts of light propagation in the period between Aristotle and Snell? 12. When was the idea of vision by emission from the eyes first discredited? a. When was the concept that the eyes capture light as it is reflected from objects to produce an image in the eye ultimately accepted as the explanation of vision?

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