Advertisements
Advertisements
Question
The colour of sky, in direction other than of the sun, is blue. Explain.
Advertisements
Solution
As the light travels through the atmosphere, it gets scattered in different directions by the air molecules present in its path. The blue light due to its short wavelength is scattered more as compared to the red light of long wavelength. Thus the light reaching our eye directly from the sun is rich in red colour, while the light reaching our eye from all other directions is the scattered blue light. Therefore, the sky in a direction other than in the direction of the sun is seen blue.
APPEARS IN
RELATED QUESTIONS
How many colours are there in a full spectrum of white light? Write the various colours of spectrum in the order, starting with red.
State whether the following statements are true or false:
The scattering away of red light makes the sky appear blue during the day time.
The sky appears blue because some of the blue component of sunlight is scattered by:
(a) gas molecules present in air
(b) dust particles present in air
(c) water droplets suspended in air
(d) soot particles present in air
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 front 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?
Complete the following statement:
When the sun is setting, the light from it has to travel a ................ thickness of the earth's atmosphere and only ................ wavelength ................ light is able to reach us. Sunset is therefore ................
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.
In the atmosphere which colour of light gets scattered the least?
The bluish colour of water in deep sea is due to ____________.
How can we explain the reddish appearance of sun at sunrise or sunset? Why does it not appear red at noon?
