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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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(a) The essential condition for Rayleigh scattering is that size of scatterer (x) must be far less than the wavelength of light.
(b) The intensity of scattered light (I_s) varies inversely as the fourth power of wavelenth (lamda) i.e., `I_s prop (1)/(lamda^4)`.
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