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Northern Lights photos

Presentation of pictures, photographs, articles and links related to the Aurora Borealis, or northern lights.

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Hendrik Antoon Lorentz

Hendrik Antoon Lorentz (1853 - 1918) aimed to extend Maxwell's theory of electricity and of light. Already in his doctor's thesis, he treated the reflection and refraction phenomena of light from ...

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This page explain what polarisation is, and how light can be polarised using filters, reflection, refraction or scattering.

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The Color of Light

What happens when coloured lights are added. An experiment shows the effects of adding red, green and blue. Main site has hundreds of similar useful links with a good search facility.

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Tutorial on refraction and calculating refractive index. Move arrows to start simulations.

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Refraction and Reflection

Java applet demonstrating Snell's law showing both reflected and refracted light rays.

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Refraction, Snell's law and total internal reflection

A concise but detailed explanation of refraction. Clear diagrams and worked examples, some harder than others.

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The vergence of light is defined by where n is the index of refraction of the medium and L is the distance in accordance with the Cartesian sign convention.

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Interference or Refraction?

The mathematics of refraction in materials with non-uniform optical densities leading to path differences and interference.

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Snell's Law

Applet showing refraction of light from medium 1 to medium 2. refractive indices and incident angle can be altered, and total internal reflection demonstrated.

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