Why does sun appear in oval shape during sunset and sunrise? explain with the help of ray diagram.
it is due 2 the refraction faced by the light particles
It's an optical illusion caused by the bending of the light rays as they pass through the Earth's atmosphere. In fact, when the Sun appears oval like that, the Sun is actually BELOW the horizon, the the atmosphere is refracting the light around the curvature of the Earth. The reason that sunrises and sunsets look red is because the red light is bent, or refracted, more than other colors - so the red rays go further around the Earth while the other colors pass on through the atmosphere and out into space again.