question_answer

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 [EAMCET (Engg.) 1995]

A)            \[\hat{i}\,.\,\hat{n}=\mu (\hat{r}\,.\,\hat{n})\]                         

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)            \[\mu (\hat{i}\times \hat{n})=\hat{r}\times \hat{n}\]