In the figure below,PQRS denotes the path fol | vedclass

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(B) According to Snell's Law,when a light ray travels from a medium with refractive index $\mu_1$ to a medium with refractive index $\mu_2$,it bends t

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$\mu_1 = \mu_3 < \mu_2$

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(B) According to Snell's Law,when a light ray travels from a medium with refractive index $\mu_1$ to a medium with refractive index $\mu_2$,it bends towards the normal if $\mu_2 > \mu_1$.At point $Q$,the light ray bends towards the normal,which implies that $\mu_2 > \mu_1$.At point $R$,the light ray bends away from the normal,which implies that $\mu_3 Since the emergent ray $RS$ is parallel to the incident ray $PQ$,the total deviation produced by the two interfaces must be zero. This occurs when the refractive indices of the first and third media are equal,i.e.,$\mu_1 = \mu_3$.Combining these observations,we get $\mu_1 = \mu_3 < \mu_2$.

In the figure below,$PQRS$ denotes the path followed by a ray of light as it travels through three media in succession. The absolute refractive indices of the media are $\mu_1, \mu_2$ and $\mu_3$,respectively. (The line segment $RS$ in the figure is parallel to $PQ$). Then,

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