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When size of scatterer (x) is very much ...

When size of scatterer (x) is very much less than the wavelength `(lamda)` of light, intensity of scattered light `(I_s)` varies as :

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inversely , fourth power.
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Intensity of scattered light varies…………………as……………..of wavelength of incident light.

Assertion : The blue colour of sky is on account of scattering of sun light. Reason : The intensity of scattered light varies inversely as the & fourth power of wavelength of the light.