A. Explain the formation of rainbow in the sky with the help of a diagram. List the three phenomena of light involved. Which colour – violet or red appears at top of the rainbow? B. What is the difference in colours of the sun observed during sunrise/sunset and noon? Give explanation for each.
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The rainbow is a natural specturam formed by the dispersion of sunlight by tiny drops of water suspended in the air . It is always formed in a direction opposite to that of the sun. RED appears at the top
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Sun appears red at sunrise and sunset : At sinrise and sunset, sun is closer to the horizon. The sunlight passes through denser layer of air and covers larger distance before reaching our eyes. Most of the blue light gets scattered. The light that reaches our red. That is why the sun appears red at sunrise.
At noon, the sun is overhead. The sunlight passes through rares layers of air and covers shorter distance before reaching our eye. So, almost all colours of light are scattered equally. Hence the sun appears white
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