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
Which color of white light is scattered the least and why?
Name a natural phenomenon which is caused by the dispersion of sunlight in the sky.
Give the meaning of the term VIBGYOR. With which phenomenon is it connected?
Explain why, if we look at objects through the hot air over a fire, the objects appear to be moving (or shaking) slightly.
Why does the sky appear dark (or black) to an astronaut instead of blue?
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 clouds are seen white. Explain
What is the colour of the clear sky during day time? Give reason for it.
Answer the following question:
Why is the Tyndall effect shown by colloidal particles? State four instances of observing the Tyndall effect.
Draw a labelled diagram to show (i) reddish appearance of the sun at the sunrise or the sunset and (ii) white appearance of the sun at noon when it is overhead.
