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$\hat i\,.\,\hat n = \mu (\hat r\,.\,\hat n)$
- B$\hat i \times \hat n = \mu (\hat n \times \hat r)$
- ✓$\hat i \times \hat n = \mu (\hat r \times \hat n)$
- D$\mu (\hat i \times \hat n) = \hat r \times \hat n$
