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What is the minimum angle of deviation for a thin prism equal to? ('n21' is refractive index of the material of the prism and 'A' is the angle of the prism)

What is the minimum angle of deviation for a thin prism equal to? ('n21' is refractive index of the material of the prism and 'A' is the angle of the prism) Correct Answer (n<sub>21</sub>-1)A

CONCEPT:

  • Dispersion of light: The phenomenon in which a white light ray when falls on a prism get separated into its component colors is called dispersion of light.
  •  Different colors of different wavelengths experience different degrees of deviation and hence when putting through refraction, white light splits into its constituent colors.
  • When light rays fall on the prism then there is the deviation in the path of the ray after refraction through the prism.
  • For a thin prism deviation angle is very small.

The minimum deviation angle (δ) for a thin prism of prism angle A is given by:

δ = (n21 - 1) A

Where n21 is the refractive index of the Prism

EXPLANATION:

  • The minimum angle of deviation for a thin prism equal to (n21 - 1) A. So option 2 is correct.

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