Discussion
When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is
Answer: B
The red ray is deviated least.
Deviation depends on refractive index, and \(n\) falls as wavelength rises - Cauchy's relation. Red has the longest visible wavelength, so glass bends it least; violet, at the short end, is bent most. That difference in deviation is dispersion, and is what spreads the light into a spectrum.
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