Advertisements
Advertisements
प्रश्न
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.
उत्तर
The Sun is visible to us two minutes before the sunrise and two minutes after the sunset because of the bending of the light due to atmospheric refraction. The actual sunrise takes place when the Sun is just above the horizon. But due to atmospheric refraction of light, we see the Sun about two minutes before it is actually above the horizon.
When the Sun is slightly below the horizon, its light moves from less dense air to more dense air and gets refracted towards the normal. Because of this atmospheric refraction, the Sun appears to be above the horizon when it is actually slightly below the horizon. It is also due to atmospheric refraction that we can still see the Sun for about two minutes even after it has set below the horizon.
APPEARS IN
संबंधित प्रश्न
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 appear reddish early in the morning? Will this phenomenon be observed by an observer on the moon? Justify your answer with a reason.
What is a rainbow? Draw a labelled diagram to show the formation of a rainbow.
Where in nature can you find evidence that white sunlight may be made of different colours?
State whether the following statements are true or false:
The scattering away of blue light makes the sun appear red at sunset.
The blue colour of sky is due to:
(a) refraction of light
(b) dispersion of light
(c) diffraction of light
(d) scattering of light
The danger signal is red. Why?
What characteristic property of light is responsible for the blue colour of the sky?
Describe an experiment to show that “sunlight is essential for photosynthesis”.
A beam of blue, green, and yellow light passes through the earth's atmosphere. Name the colour which is scattered the least.
