What is the major difference in the answers that are obtained when focusing light with a...
What is the major difference in the answers that are obtained when focusing light with a lens a) if ray theory is applied to the problem? and 2) if diffraction theory is applied to the problem?
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When the phenomena of light focussing is studied with ray theory, then we get exact measurements for the focal plane of the lens and also exact geometries for the light rays travelling after suffering refraction. That is, we can say with absolute certainty that the rays of light focusses at point A, for example.
However, if the same phenomena is studied with the help of diffraction theory, the geometries of the light rays as well as the focusing plane becomes slightly ambiguous. Since in this theory, we mainly deal with wavefronts rather than straight rays of lght, the focussing of the light rays itself appears to have a spread, rather than a single point.
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