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According to Rayleigh's law, the amount of scattering of light is inversely proportional to which power of its wavelength?
AThe first power
BThe second power
CThe fourth power
DThe third power
Answer & Solution
Correct answer: C. The fourth power
1. Rayleigh's scattering law states $S' \propto \dfrac{1}{\lambda^4}$.
2. The exponent on the wavelength is 4.
3. So scattering is inversely proportional to the fourth power of wavelength.
4. This is why short-wavelength blue light scatters far more than red.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 2 Optics "Scattering of Light", p.25_
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