Refraction at plane surfaces

The principle of reversibility of light

The principle of reversibility of light The principle of reversibility of light, which states that the paths of light rays are reversible, has already been mentioned in connection with reflection on page 237. The same holds true in the case of refraction and, indeed, for rays passing through any optical system. The refractive indices for a ray passing …

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The laws of refraction

The laws of refraction Although many scientists worked on the problem, the laws governing the refraction of light when it passes from one substance to another resisted discovery for centuries. It was not until 1621 that Willebrord Snell, Professor of Mathematics at Leyden University, discovered the exact relationship between the angles of incidence and refraction. The laws of refraction …

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