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An Experiment to investigate the change of speed of light through perspex.
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An Experiment to investigate the change of speed of light through perspex Aim To measure the change of speed of light in perspex and the in the air and record the lateral displacement of the ray. Background Information Light is an electromagnetic wave. The speed of light depends on the medium through which it propagates: it goes fastest in vacuum, almost as fast in air but considerably slower in glass. The speed of light in vacuum has been given its own symbol: c. The speed of light in any other material is denoted with v. The ratio of the two is known as the refractive index with the symbol n. When light goes from one medium to another, it doesn't only change its speed. Part of the incident light is reflected, and the remainder is transmitted. The transmitted light is generally also deviated or refracted. It was found experimentally by Descartes and by...
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