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optics
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Are invisibility cloaks possible in reality?
Understand how a pinhole focuses light and why lenses are better than pinholes
reflection of light Figure 1: The law of refraction. Plane light wave at position AA′ in medium of index n and BB′ in medium of index n′ (see text). Figure 2: Relationships between refractive indices and dispersive powers of several representative optical glasses and plastics. The hair-thin fibres used in fibre optics. Figure 3: Graphic refraction procedures (see text). Figure 4: Trigonometrical ray tracing (see text). Figure 5: The Gauss theory (see text). Figure 6: Operating principle of the telescopic rifle sight (see text).
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The hair-thin fibres used in fibre optics.
optics summary
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optics: Related Content

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Photos and Videos

reflection of light
Figure 1: The law of refraction. Plane light wave at position AA′ in medium of index n and BB′ in medium of index n′ (see text).
Figure 2: Relationships between refractive indices and dispersive powers of several representative optical glasses and plastics.
The hair-thin fibres used in fibre optics.
Figure 3: Graphic refraction procedures (see text).
Figure 4: Trigonometrical ray tracing (see text).
Figure 5: The Gauss theory (see text).
Figure 6: Operating principle of the telescopic rifle sight (see text).
Figure 7: Porro prism.
optical fibre
Are invisibility cloaks possible in reality?
Understand how a pinhole focuses light and why lenses are better than pinholes
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Key People

Understanding Newton's theory of universal gravitation
Isaac Newton
English physicist and mathematician
Johannes Kepler
Johannes Kepler
German astronomer
Helmholtz.
Hermann von Helmholtz
German scientist and philosopher
Joseph Priestley
Joseph Priestley
English clergyman and scientist
Roger Bacon
Roger Bacon
English philosopher and scientist
Fermat, portrait by Roland Lefèvre; in the Narbonne City Museums, France
Pierre de Fermat
French mathematician
Lord Rayleigh, engraving by R. Cottot.
Lord Rayleigh
British scientist
Fresnel, detail of an engraving by Ambroise Tardieu after a contemporary portrait, 1825
Augustin-Jean Fresnel
French physicist
Glauber, Roy J.
Roy J. Glauber
American physicist
Sir David Brewster
Scottish physicist
Amici, Giovanni Battista
Giovanni Battista Amici
Italian astronomer
Barlow, Peter
Peter Barlow
English optician and mathematician
Raymond Neil Wilson
British physicist
Peiresc, Nicolas-Claude Fabri de
Nicolas-Claude Fabri de Peiresc
French humanist
Lippershey, Hans
Hans Lippershey
Dutch inventor
Giuseppe Campani
Italian inventor
Silvanus Phillips Thompson
British physicist and historian
Frits Zernike
Dutch physicist
John Dollond
British optician
James Short
British optician and astronomer