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What are two types of reflexive index ? |
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Answer» There are two types of indexes of refraction:Absolute index : The absolute index of refraction is the ratio for light passing from a vacuum into a substance. When we refer to the index of refraction of a substance, we mean its absolute index, since the absolute index of refraction of air is so close to n = 1.For example: nwater\xa0= 1.33 and nglass\xa0= 1.50In practice, it is determined by the slope of a graph of sine r = f (sine i), where air is the refracting medium. In the case where air is the incident medium, the absolute index of the unknown substance equals the reciprocal of the slope (1/slope).Relative index: The relative index of refraction corresponds to the ratio of the optical densities of the two substances. Mathematically, it is expressed as a ratio of absolute indexes.It is determined by the slope of a graph of sin r = f (sin i).Consequently, when a relative refraction index is given, the incident and refractive media will always be mentioned. Absolute n relative..... |
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