Answer:
(a) The refracted wavefront CE is shown in Fig. \[\sin i=\frac{BC}{AC}=\frac{{{\upsilon }_{1}}t}{AC}\] \[\sin r=\frac{AE}{AC}=\frac{{{\upsilon }_{2}}t}{AC}\] \[\therefore \] \[\frac{\sin i}{\sin r}=\frac{{{\upsilon }_{1}}}{{{\upsilon }_{2}}}\] or \[^{1}{{\mu }_{2}}=\frac{{{\upsilon }_{1}}}{{{\upsilon }_{2}}}=\]a constant This prove Snell?s law of refraction. (b) Explanation. The time taken by any disturbance to travel from incident wave front to the refracted or reflected wave front is same.
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