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प्रश्न
The clouds are seen white. Explain
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उत्तर
The clouds are nearer the earth surface and they contain dust particles and aggregates of water molecules of sizes bigger than the wavelength of visible light. Therefore, the dust particles and water molecules present in clouds scatter all colours of incident white light from sun to the same extent and hence when the scattered light reaches our eye, the clouds are seen white.
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संबंधित प्रश्न
What is meant by scattering of light? Use this phenomenon to explain why the clear sky appears blue or the Sun appears reddish at sunrise.
With the help of scattering of light, explain the reason for the difference in colours of the Sun as it appears during sunset/sunrise and noon.
Why does the sun seem to rise two minutes before the actual sunrise and set two minutes after the actual sunset ? Explain with the help of labelled diagram.
Name some everyday objects:
which reflect all the colours in sunlight
In an experiment to study the scattering of light by passing a beam of white light through a colloidal solution of sulphur in a transparent glass tank:
Which colour is observed from the sides of the glass tank? Does this colour correspond to the colour of sky on a clear day or the colour of sky around the sun at sunset?
The danger signal is red. Why?
What is the colour of the clear sky during day time? Give reason for it.
Name the point on the lens through which a ray of light passes undeviated.
Is the position of a star as seen by us its true position? Justify your answer.
How can we explain the reddish appearance of sun at sunrise or sunset? Why does it not appear red at noon?
