With the Speed of Light

Adam O.	Dino F.	waldemar e.	Alfons R.	Ayan M.	Serge M.	Martin P.	Judita S.

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Image Title: With the Speed of Light

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By: Paul de Beukelaar
Copyright ©2008

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Photographer	Paul de Beukelaar {Karma:26449}
Project	#52 Patterns in Nature	Camera Model	Lumix DMC-FZ50 (Panasonic)
Categories	Nature Scientific Historical	Film Format	Digital JPEG
Portfolio		Lens	Leica
Uploaded	8/1/2008	Film / Memory Type	JPEG
		ISO / Film Speed	100
Views	478	Shutter	1/250
Favorites	0	Aperture	f/5.6
Critiques	26	Rating	6.65 / 10 Ratings
Location	City - Broek-in-Waterland State - NOORD-HOLLAND Country - Netherlands
About	This is a rare observation of a “Demolished Cow” and I will try to explain why : History of thoughts about the speed of light : Until relatively recent times, the speed of light was largely a matter of conjecture. Empedocles maintained that light was something in motion, and therefore there had to be some time elapsed in travelling. Aristotle said that, on the contrary, "light is due to the presence of something, but it is not a movement". Furthermore, if light had a finite speed, it would have to be very great; Aristotle asserted "the strain upon our powers of belief is too great" to believe this. Euclid proposed the emission theory of vision, (also advanced by Ptolemy) where light was emitted from the eye, instead of entering the eye from another source. Using this theory, Heron of Alexandria advanced the argument that the speed of light must be infinite, since distant objects such as stars appear immediately upon opening the eyes. Early Muslim philosophers initially agreed with the Aristotelian view of the speed of light being infinite. In 1021, however, the Iraqi physicist, Ibn al-Haytham (Alhazen), published the Book of Optics, in which he used experiments to support the intromission theory of vision, where light moves from an object into the eye, making use of instruments such as the camera obscura. This led to Alhazen proposing that light must therefore have a finite speed and that the speed of light is variable, with its speed decreasing in denser bodies. He argued that light is a “substantial matter”, the propagation of which requires time “even if this is hidden to our senses”. This debate continued in Europe and the Middle East throughout the Middle Ages. A comment on a verse in the Rigveda by the 14th century Indian scholar Sayana may be interpreted as suggesting an estimate for the speed of light that is in good agreement with its actual speed. In 1574, the Ottoman astronomer and physicist Taqi al-Din agreed with Alhazen that the speed of light is finite, but variable in denser bodies. In the early 17th century, Johannes Kepler believed that the speed of light was infinite since empty space presents no obstacle to it. Francis Bacon argued that the speed of light was not necessarily infinite, since something can travel too fast to be perceived. René Descartes argued that if the speed of light were finite, the Sun, Earth, and Moon would be noticeably out of alignment during a lunar eclipse. Since such misalignment had not been observed, Descartes concluded the speed of light was infinite. Descartes speculated that if the speed of light was found to be finite, his whole system of philosophy might be demolished. Conclusion :-) I saw this cow just demolished because the speed of light is now generally be considered to be finite = 3x10**8 m/s ... but if somebody could prove the contrary my theory will not hold any longer. This acording to Popper, my life-time friend in creating temporary truth.

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There are 26 Comments in 1 Pages
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biljana mitrovic {K:48110} 8/7/2008

Oh,dear Pol,I almost forgot I've been on holiday..it was in first half of June :((( and I already need new one .... but working class must work ;))

I really do hope that experiment with animals will stop very soon...and also I do hope your photographic experimental will never stop..really enjoy in them :))

Big hug from belgarde
biljana