A light ray enters from medium A to medium B | vedclass

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(A) From the figure,we can observe the angles of incidence $(i)$ and refraction $(r)$.By comparing the angles with the normal,we see that the angle of

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greater than unity

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(A) From the figure,we can observe the angles of incidence $(i)$ and refraction $(r)$.By comparing the angles with the normal,we see that the angle of refraction $(r)$ is smaller than the angle of incidence $(i)$,i.e.,$r According to Snell's Law,the refractive index of medium $B$ with respect to medium $A$ is given by $n_{BA} = \frac{\sin i}{\sin r}$.Since $i > r$,it follows that $\sin i > \sin r$,which implies that $\frac{\sin i}{\sin r} > 1$.Therefore,the refractive index of medium $B$ relative to $A$ is greater than unity.

$A$ light ray enters from medium $A$ to medium $B$ as shown in the figure. The refractive index of medium $B$ relative to $A$ will be

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