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Q. State Huygen's principle.
Huygen's principle:
(a) Every point on a specified wave front may be considered as a source of secondary wavelets which spread out with the speed of light in that medium and
(b) The new wave front is the presumptuous envelope of the secondary wavelets at that instant.
if length changes then there is change in the time period how to solve these questions regards
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explain quantization of charge
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