A plane wavefront travelling in a straight li | vedclass

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(B) When a plane wavefront enters a medium of refractive index $\mu,$ the speed of light decreases from $c$ to $\frac{c}{\mu}.$Because the speed is lo

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(B) When a plane wavefront enters a medium of refractive index $\mu,$ the speed of light decreases from $c$ to $\frac{c}{\mu}.$Because the speed is lower in the medium,the part of the wavefront passing through the medium travels a shorter distance in the same time interval compared to the part traveling in vacuum.This causes the wavefront to lag behind in the region where the medium is present.As a result,the wavefront becomes discontinuous,with the portion inside the medium lagging behind the portion in the vacuum,forming a broken line shape at point $P$ as shown in option $(B).$

$A$ plane wavefront travelling in a straight line in vacuum encounters a medium of refractive index $\mu$. At point $P,$ the shape of the wavefront is:

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