Essay Newton - Revision history

Admin at 05:55, 24 August 2016

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Admin at 05:47, 24 August 2016

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Admin: /* Summary */

2016-08-24T05:45:10Z

Summary

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 * Quantitative approach
 * Experimentum Crucis
 * Deductions
 * Further experiments
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 * Rotating prism 1 about its axis and casting different parts of the projection onto the first board, those rays then passed through the second board and through the second prism and were reflected on the wall behind.
 * Experiments focused on '''where''' on the wall the rays passing through prism 1 and prism 2 were projected
+* By examining the variation of '''where''' on the opposite wall the rays of light were reflected, observed that light from the end of hte imate toward which the refraction of P1 was made, suffered considerably ''greater'' refraction passing through P2 than light tending to the other end.

Admin: Created page with "==Introduction== While reading Newton's Philosophy of Nature, I was particularly struck by the essay "The New Theory About Light and Colors" on p. 68. {{Quote| I pro..."

2016-08-24T05:22:14Z

Created page with "==Introduction== While reading <u>Newton's Philosophy of Nature</u>, I was particularly struck by the essay "The New Theory About Light and Colors" on p. 68. {{Quote| I pro..."

New page

==Introduction==

While reading <u>Newton's Philosophy of Nature</u>, I was particularly struck by the essay "The New Theory About Light and Colors" on p. 68.

{{Quote|
I procured me a triangular glass prism, to try therewith the celebrated phenomena of colors.

- p. 68
}}

==Summary==

A brief summary of the essay:
* Initial experiments
* Quantitative approach
* Experimentum Crucis
* Deductions
* Further experiments

Initial experiments with the prism:
* Newton procured himself a prism
* He procured a dark room, made a small hole for light to come through, placed prism in front
* Observed that the projection on the opposite wall was oblong, not circular; L = 5 W
* Tested effect of variables: thickness of prism, brightness of light, prism inside versus outside the window
* Observed: these had no effect on the shape of the projection - still oblong, still L = 5 W
* Tested whether it was defects in the prism by putting 2 prisms next to each other (second one "reverses" refraction of first)
* Observed that 1st prism turned a circular hole into an oblong shape; 2nd prism turned oblong shape into orbicircular with same regularity as if there were no prisms
* Deduced there were no imperfections in the prism glass/surface causing the oblong shape

Quantitative approach:
* Began to measure various aspects of configuration
* Distance from hole to prism, utmost length, breadth, diameter of hole, angle of rays, vertical angle of prism, angle of refraction on both sides
* Quantified difference between L and W (L = 5 W)
* Computed refractive power of glass from Law of Sines
* For 2 rays coming from opposite sides of sun's disc, determined angle they would form, verified measurements with calculation
* Still no explanation for L = 5 W
* Playing with prism angle, rotated it on its axis (obliqueness to rays of sun)
* Observed no effect
* The difference of incidence angles of rays coming from opposite sides of sun's disc, both show that W checks out - but L = 5 W does not
* Hypothesis: rays, after passing through prism, move in curved trajectories
* Analogy: tennis ball, when struck and rotating, has curvature induced by spin, higher drag on one side of the ball causing arc, if light similarly had drag it would also curve
* Observed no curvature of light, just that difference between L and the diameter of the hole was proportional to distance between them (projected shape gets larger as the hole gets further away)

Experimentum Crucis:
* 2 boards, 2 prisms:
* Window slit --> prism --> board with hole --> board with hole --> prism
* Rotating prism 1 about its axis and casting different parts of the projection onto the first board, those rays then passed through the second board and through the second prism and were reflected on the wall behind.
* Experiments focused on '''where''' on the wall the rays passing through prism 1 and prism 2 were projected
*