question_answer

In a thin prism of glass (refractive index 1.5),  which of the following relations between the angle of minimum deviations \[{{\delta }_{m}}\] and angle of refraction \[r\] will be correct  [MP PMT 1990]

A)            \[{{\delta }_{m}}=r\]        

B)            \[{{\delta }_{m}}=1.5\,r\]

C)            \[{{\delta }_{m}}=2r\]      

D)            \[{{\delta }_{m}}=\frac{r}{2}\]