Angle of Deviation

Last updated at July 25, 2026 by

In a prism, the angle between the Incident Ray and the Emergent Ray is called the Angle of Deviation angle-of-deviation---teachoo.jpg

 

The Angle of deviation in a prism depends upon:

  • Refractive index of the prism -  The larger the refractive index, the larger the angle of deviation.
  • Angle of the prism (i.e. Angle A in the figure) -  The larger the prism angle, the larger the deviation angle.
  • Angle of incidence: Angle of deviation first increases with increasing incidence angle, and then decreases.
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