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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.
Explain about the term electron microscope. Electron microscope: An electron microscope is a form of microscope which uses electrons to illuminate a specimen and make an enl
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