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english summary.ppt

english summary.ppt
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1English Summary1. The electromagnetic spectrumGammaRaysX-RaysUltravioletV Infra-redMicro-wavesRadio-waveslongshortWave length380nm violet-blue780nm deep-red22. Law of Rectilinear propagationLight as it advances through free space or through homogeneous, isotropic matter follows a beeline. (a direct straight course).Example: Shadows33. The Law of ReflectionA light ray striking a reflecting surface and reflected from it makes equal angles with the normal to the surface at the point of incidence, and the incoming ray, the outgoing ray, and the normal to the surface at the point of intersection all lie in the same plane.44. The Law of RefractionThe angle made by the incident ray, that made by the refracted ray, and the surface normal at the point of incidence in a refractive process obey the expressionnsinI=n''sinI’The incident ray, the refracted ray, and the surface normal are all coplanar.55. Total Internal ReflectionnormalIncident rayRefracted rayDenser mediumRarer mediumCritical angleSurface66. Fermat’ principleLight takes the path that requires the least time.77. Key words and conceptImage space extends from infinity on one side to infinity on the other. The same holds for the object space; both completely overlap. Whether a given point is in the object space or the image space depends on whether it is part of a ray before or after refraction. If a given point is in the object space, it is a point object, otherwise it is a point image. 8Key words and Concept? The index of refraction, or refractive index, of any

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