A ray diagram showing refraction at the boundary between air and glass Refraction can cause optical illusions as the light waves appear to come from a different position to their actual source.

Reflection and refraction of light and elastic waves are considered, especially phenomena where simple assumptions break down. Mode conversion of elastic waves during reflection and refraction ...

Refraction is the change in direction of a wave as it travels from one medium to another. For instance, when light travels from air to glass or water waves travel from deep to shallow water.

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An explanation of double refraction is followed by Lawrence Bragg demonstrating its effects by means of Polaroid, a crystal of calcite and a lamp incorporating an iris diaphragm. The effects that are ...