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Ok i know that mathematically or by snell 's law it can be proved but i want to know that what is its physical significance? I mean why it does not refract at 0 degree?

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Looked at using the Huygens-Fresnel principle: each point in the wavefront will arrive on the surface at the same time. Each point is a new source emitting with the new wavelength, but as they all arrived at once, their waves are all in step so the wavefront stays the same.

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