Question

If $\hat{i}$ decrease 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. $\hat{r}.\hat{n}=\mu (\hat{r}.\hat{n})$
• B. $\hat{i}\times \hat{n}=\mu (\hat{n}\times \hat{r})$
• C. $\hat{i}\times \hat{n}=\mu (\hat{r}\times \hat{n})$
• D. $\mu (\hat{i}\times \hat{n})=\hat{r}\times \hat{n}$

Answer 1

The correct option is C $\hat{i}\times \hat{n}=\mu (\hat{r}\times \hat{n})$

Snell's law in vector from is $\hat{i}\times \hat{n}=\mu (\hat{r}\times \hat{n})$