<P> Also, the variation of angle of deviation with an arbitrary angle of incidence can be encapsulated into a single equation: </P> <P> D = i − A + arcsin ⁡ (n ⋅ sin ⁡ (A − arcsin ⁡ (sin ⁡ i n))) (\ displaystyle D = i - A+ \ arcsin \ left (n \ cdot \ sin \ left (A - \ arcsin \ left ((\ frac (\ sin i) (n)) \ right) \ right) \ right)) </P> <P> Where, D (\ displaystyle D) is the angle of deviation at an arbitrary angle of incidence i (\ displaystyle i), and n (\ displaystyle n) is the refractive index of the prism . </P> <P> It may be noted that minimum deviation in a rectangular slab is zero as both the surfaces separating two media are parallel, whereas, in a prism they are inclined to each other . </P>

How to calculate angle of deviation in a prism