MCQ
If $\hat{i}$ denotes a unit vector along incident light ray, $\hat{r}$ a unit vector along refracted ray into a medium of refractive index $\mu$ and $\hat{n}$ unit vector normal to boundary of medium directed towards incident medium, then law of refraction is
- A$\hat{i} \cdot \hat{n}=\mu(\hat{r} \cdot \hat{n})$
- B$\hat{i} \times \hat{n}=\mu(\hat{n} \times \hat{r})$
- ✓$\hat{i} \times \hat{n}=\mu(\hat{r} \times \hat{n})$
- D$\mu(\hat{i} \times \hat{n})=\hat{r} \times \hat{n}$
