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

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(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 wavelength of light, then intensity of scattered light varies inversely as fourth power of wavelength of light, i.e., I-(s) prop (1)/(lambda_(4)).