Question

As angle of incidence on the first face of a prism increases, then the angle of deviation of emergent ray:

• A. increases
• B. decreases
• C. first increases then decreases
• D. first decreases then increases

Answer 1

Answer: (D)

first decreases then increases

As angle of incidence on the first face of a prism increases deviation of emergent rays first decreases to a minima

at ($i$,$2i-A$) and again increases as given in graph belong.