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If the refractive index of the prism is 1.5, then calculate the angle of prism for which the angle of deviation is 60°.

If the refractive index of the prism is 1.5, then calculate the angle of prism for which the angle of deviation is 60°. Correct Answer 120°

CONCEPT:

  • Prism is a transparent medium bounded by refracting surfaces, such that the incident surface (on which light ray is incident) and emergent surface (from which light rays emerges) are planes and non-parallel.
  • The relation between the refractive index, angle of deviation and angle of a prism is given by


δ = (μ -1)A

Where A = angle of the prism, δ = angle of deviation and μ = refractive index

CALCULATION:

Given - μ = 1.5 and δ = 60°

⇒ δ = (μ -1)A

⇒ 60° = (1.5 - 1)A

⇒ A = 60°/0.5

⇒ A = 120° 

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