Prism is a transparent phase rounded by refracting surfaces, such that the incident surface and emergent surface (from which light rays emerges) are plane and non parallel.
Refraction through a prism
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i → Angle of incidence,
e →Angle of emergence,
A → Angle of prism or refracting angle of prism,
r1 and r2 →Angle of refraction,
δ→Angle of deviation
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For surface AC 
Deviation through a prism: For thin prism δ= (μ-1)A . Also deviation is different for different color light e.g. 
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(i) Maximum deviation: Relation of maximum deviation is and taken from Snell's principle on emergent surface
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(ii) Minimum deviation: It is observed if 
any , deviation produced is minimized.
(a) Refracted wave inside the prism is parallel to the base of the prism for equilateral and isosceles prisms.
(b) 
(c) 
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