[Answer] Define wavefront. Draw the shape of refracted wavefront when the plane incident wave undergoes refraction from optically denser medium to rarer medium.

The Question : Define wavefront. Draw the shape of refracted wavefront when the plane incident wave undergoes refraction from optically denser medium to rarer medium. Hence prove Snell’s law of refraction.

Solution for the question :
A locus of points, which oscillate in phase is called a wavefront.                                       OR A wavefront is defined as a surface of constant phaseDiagram Proof: n1sin i = n2sin r (Derivation) This is the Snell’s law of refraction. 

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