CBSE Class 10CBSE
Share
Notifications

View all notifications

Explain Why, the Sun Can Be Seen About Two Minutes before Actual Sunrise. Draw a Diagram to Illustrate Your Answer. - CBSE Class 10 - Science

Login
Create free account


      Forgot password?

Question

Explain why, the sun can be seen about two minutes before actual sunrise. Draw a diagram to Illustrate your answer.

Solution

Sunrise takes place when the sun is just above the horizon, but the atmospheric refraction of light makes the sun appear two minutes before sunrise. When the sun is slightly below the horizon, the sun's rays travel from the vacuum of space to the denser air of the earth's atmosphere. When sunlight passes from a rarer medium, namely, vacuum, to the denser medium of the air in the earth's atmosphere, it bends or refracts downwards. Owing to this refraction, the sun appears to be raised above the horizon even though it is slightly below the horizon. 
In the figure below, the actual position of the sun is just below the horizon, but it appears to be just above the horizon, owing to atmospheric refraction. As a result, the sun appears to rise two minutes before the actual sunrise.  

 

  Is there an error in this question or solution?

APPEARS IN

Video TutorialsVIEW ALL [1]

Solution Explain Why, the Sun Can Be Seen About Two Minutes before Actual Sunrise. Draw a Diagram to Illustrate Your Answer. Concept: Some Natural Phenomena Due to Sunlight.
S
View in app×