question_answer

A ray of light is incident at an angle of \[60{}^\circ \] on one face of a prism of angle \[30{}^\circ \]. The ray emerging out of the prism makes an angle of \[30{}^\circ \] with the incident ray. The emergent ray is

A)  Normal to the face through which it emerges

B)  Inclined at \[30{}^\circ \] to the face through which it emerges

C)  Inclined at \[60{}^\circ \] to the face through which it emerges

D)  Inclined at \[90{}^\circ \] to the normal at face through which it emerges