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