Answer:
According to Rayleigh's law of scattering, the intensity of light of wavelength \[\lambda \] present in the scattered light is inversely proportional to fourth power of wavelength \[\lambda \] : \[I\propto \frac{1}{{{\lambda }^{4}}}\] In the visible spectrum, red colour has the largest wavelength, it is least scattered and can be easily observed even in foggy and dust conditions.
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