Can someone please mark the angle of deviation for the rectangular block in part 2bi
Q.2. The diagrams (a) and (b) in Fig. 4.34 below show the refraction of a ray of light of single colour through a prism and a parallel sided glass slab respectively.


(i) In each diagram, label the incident, refracted, emergent rays and the angle of deviation.
 

Pls refer to NCERT Science textbook page number 173 and see angle r.
that is the answer. 
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