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प्रश्न
What is meant by dispersion of white light? Describe the formation of rainbow in the sky with the help of a diagram.
उत्तर
A rainbow is formed in the sky because of the dispersion of sunlight by millions of water droplets in the atmosphere. Every single water droplet behaves like a tiny glass prism that splits the white light into different colours. Different colours bend at different angles on passing through the water droplets, thus separating the white light into a natural spectrum of seven colours, namely, violet, indigo, blue, green, yellow, orange and red. The diagram presented supports the above explanation and gives a clear picture about the formation of a rainbow.
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संबंधित प्रश्न
With the help of a labelled diagram, explain why the sun appears reddish at the sun-rise and the sun-set.
Which colour of the spectrum has
longest wavelength,
Why does the sky appear dark (or black) to an astronaut instead of blue?
The colour of sky, in direction other than of the sun, is blue. Explain.
Why does the sun appear red at sunrises and sunset?
Using the phenomenon of scattering of light, explain why there is a difference in the colour of the sun as it appears during sunrise and at noon.
What is meant by advance sunrise and delayed sunset? Draw a labelled diagram to explain these phenomena.
Draw a labeled diagram to show
(i) the reddish appearance of the sun at the sunrise or the sunset and
(ii) white appearance of the sun at noon when it is overhead.
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
Why is the colour of the clear sky blue?
