When light travels from an optically denser medium to a rarer medium, why does the critical angle of incidence depend on the colour of light ?
 

because critical angle depends on relative refractive index of media ( sin ic= refractive index) which in turn depends on wavelength.
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sin C = 1/n
we know...
               1 is directly proportional to wavelength

so indirectly sin C is directly proportional to wavelength
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