page_title: Minimum deviation
hierarchical_section_title: Minimum deviation
caption_attribution_description: English: Diagram shows a light ray being deflected as it enters and exits a prism
context_page_description: In a prism, the angle of deviation decreases with increase in the angle of incidence up to a particular angle. This angle of incidence where the angle of deviation in a prism is minimum is called the Minimum Deviation Position of the prism and that very deviation angle is known as the Minimum Angle of Deviation.
  In Minimum Deviation, the refracted ray in the prism is parallel to its base. In other words, the light ray is symmetrical about the axis of symmetry of the prism.
  Also, the angles of refractions are equal i.e. And, the angle of incidence and angle of emergence equal each other. This is clearly visible in the graph in the next section.
context_section_description: In a prism, the angle of deviation() decreases with increase in the angle of incidence() up to a particular angle. This angle of incidence where the angle of deviation in a prism is minimum is called the Minimum Deviation Position of the prism and that very deviation angle is known as the Minimum Angle of Deviation (denoted by ,  or ).
  In Minimum Deviation, the refracted ray in the prism is parallel to its base. In other words, the light ray is symmetrical about the axis of symmetry of the prism. 
  Also, the angles of refractions are equal i.e. . And, the angle of incidence and angle of emergence equal each other (). This is clearly visible in the graph in the next section.
caption: A ray of light is deflected twice in a prism. The sum of these deflections is the deviation angle.
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