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When white light is refracted through a glass prism and splits into its component colours (VIBGYOR), which colour is bent through the largest angle of refraction?
AViolet
BRed
CYellow
DGreen
Answer & Solution
Correct answer: A. Violet
1. Dispersion occurs because the refractive index of the prism differs for each colour.
2. The angle of refraction is smallest for red and largest for violet.
3. Violet has the shortest wavelength, giving it the highest refractive index and largest bending.
4. So violet is deviated most; red is deviated least.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 2 Optics "Refraction of a Composite Light - Dispersion", p.24_
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