question_answer

A ray is incident normally on a right angle prism whose refractive index is \[\sqrt{3}\] and prism angle a \[\alpha =30{}^\circ ,\] after crossing prism ray passes through glass sphere. It strikes the glass sphere at \[\frac{R}{\sqrt{3}}\] distance from principal axis, as shown in figure sphere is half polished. Find the net angle of deviation of incident ray. 

A) \[120{}^\circ ~\]

B) \[150{}^\circ ~\]

C) \[90{}^\circ ~\]

D) \[180{}^\circ \]