Question
What is optically denser and optically rarer medium?
✓
Answer
$\bullet$ Optical denser medium:
$\rightarrow$ If $n_{21}>1$, then from $\frac{\sin i}{\sin r}=n_{21}$
$ \frac{\sin i}{\sin r}>1$
$\therefore i>r$
$\rightarrow$ Hence, refracted ray bends towards the normal.
$\rightarrow$ Here, medium $2$ is said to be denser as compared to medium $1$ .
$\bullet$Optically rarer medium :
$\rightarrow$ If $n_{21}<1$, then
$ \frac{\sin i}{\sin r}<1$
$\therefore i < r $
$\rightarrow$ Hence, refracted ray goes away from normal.
$\rightarrow$ Here, medium $2$ is said to be rarer as compared to medium $1$ .
$\rightarrow$ If $n_{21}>1$, then from $\frac{\sin i}{\sin r}=n_{21}$
$ \frac{\sin i}{\sin r}>1$
$\therefore i>r$
$\rightarrow$ Hence, refracted ray bends towards the normal.
$\rightarrow$ Here, medium $2$ is said to be denser as compared to medium $1$ .
$\bullet$Optically rarer medium :
$\rightarrow$ If $n_{21}<1$, then
$ \frac{\sin i}{\sin r}<1$
$\therefore i < r $
$\rightarrow$ Hence, refracted ray goes away from normal.
$\rightarrow$ Here, medium $2$ is said to be rarer as compared to medium $1$ .
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