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Dispersion and Spectra — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsDispersion and Spectra1 Mark
Question
The angular dispersion produced by a prism:
  1. Increases if the average refractive index increases.
  2. Increases if the average refractive index decreases.
  3. Remains constant whether the average refractive index increases or decreases.
  4. Has no relation with average refractive index.
✓

Answer

  1. Increases if the average refractive index increases.

Explanation:

If $\mu$ is the average refractive index and A is the angle of prism, then the angular dispersion produced by the prism is given by $\delta=(\mu-1)\text{A}.$

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