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Dispersion of White Light by Glass Prism

Which of the ...

Question

Which of the following coloured light has the least speed in glass prism?
(a) violet
(b) yellow
(c) red
(d) green

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Solution

(a) Violet

The colour violet travels the slowest in a glass prism owing to its short wavelength.

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Q. Which of the following colour of white light is least deviated by the prism?
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3.0 \times 10^{8} m s^{- 1})

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