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Dispersive power of the material of the prism is 0.0221. If the deviation produced by it for yellow color is 38°, then the angular dispersion between red and violet color is?

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Dispersive power of the material of the prism is 0.0221. If the deviation produced by it for yellow color is 38°, then the angular dispersion between red and violet color is?

(a) 0.84°

(b) 0.65°

(c) 0.48°

(d) 1.26°

This question was posed to me during an internship interview.

My question is taken from Dispersion, Fermat’s Principle & its Application in portion Optics of Engineering Physics II

1 Answer

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The correct answer is (a) 0.84°

The best explanation: Angular dispersion = deviation produced * dispersive power

angular dispersion = (38°) * (0.0221)

therefore, angular dispersion = 0.8398°  Ξ 0.84°.

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