031. a) Duline a wave front, b) Draw the diagram to show the shape of plane wave front as they pass
through a thin prism and (ii) a thin convex lens. State the nature of refracted wave front, c) Verily
Snell's law of refraction using Huygens's principle.
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When identical waves having a common origin travel through a homogeneous medium, the corresponding crests and troughs at any instant are in phase; i.e., they have completed identical fractions of their cyclic motion, and any surface drawn through all the points of the same phase will constitute a wave front. ...
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