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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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.