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The minimum deviation is observed with a prism having the angle of prism A, the angle of deviation δ, the angle of incidence i and angle of emergence e. We then have generally

The minimum deviation is observed with a prism having the angle of prism A, the angle of deviation δ, the angle of incidence i and angle of emergence e. We then have generally Correct Answer i = e

CONCEPT:

  • Dispersion of light: The phenomenon in which a white light rays when falls on a prism get separated into its component colors is called dispersion of light.
  • When light rays fall on the prism then there is a deviation in the path of the ray after refraction through the prism. 

 

/sin(A/2)

n = relative refractive index of the prism,

A = angle between the two relevant prism faces 

EXPLANATION:

  • The minimum deviation (δ) in a prism occurs when the entering angle and the exiting angle are the same (symmetrical configuration)
  • Thus the angle of incidence is equal to the angle of emergence.

i.e ∠ i = ∠ e so option 3 is correct.

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