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(a) What is the essential condition for ...

(a) What is the essential condition for Rayleigh scattering ?
(b) In Rayleigh scattering, how is intensity of scattered light related to wavelength of light ?

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When size of scatterer is much smaller than wavelngth of light, then intensity f scattered light varies inversely as fourth power of wavelength of light, i.e., `I_s prop (1)/(lamda^4)`.
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