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Dispersion and Spectra — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsDispersion and Spectra1 Mark
MCQ
The angular dispersion produced by a prism:
  • ✓
    Increases if the average refractive index increases.
  • B
    Increases if the average refractive index decreases.
  • C
    Remains constant whether the average refractive index increases or decreases.
  • D
    Has no relation with average refractive index.
✓

Answer

Correct option: A.
Increases if the average refractive index increases.
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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