Question

why does the rising sun appears red in colour

Answer 1

the color red has maximum wavelength and minimum deviation and so it dominates over the other colours of spectrum

Answer 2

HI

At sunrise the sun is near the horizon and so the light of the sun has to travel a greater distance through the atmosphere. The particles present in the atmosphere scatter away the blue light and shorter wavelengths. Therefore, the remaining light of longer wavelengths reaches our eyes. Hence, the rising sun appears red.

Hope it proved to be beneficial....