A light ray is incident on face AB of a prism ABC as shown in figure. The second prims is ketp in such a manner the emergent ray from prism ABC is falling normally on face A'B' of prism A'B'C'. The net deviation by optical system two prisms is (8k) degree. find the value of k.

A light ray is incident on face AB of a prism ABC as shown in figure.

1.	A light ray is incident on face AB of a prism ABC as shown in figure. The second prims is ketp in such a manner the emergent ray from prism ABC is falling normally on face A'B' of prism A'B'C'. The net deviation by optical system two prisms is (8k) degree. find the value of k.
Answer» ANSWER :6