Q8 of 234 Page 292

Why do stars seem higher than they actually are? illustrate your answer with the help of a diagram.

Because of atmospheric refraction of light coming from the star while passing through the successive denser layers of earth's atmosphere stars seem higher than they actually are. It can be illustrated through a diagram:-


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6

Name the phenomenon due to which the stars seem higher in the sky than they actually are.

 7

Fill in the following blanks with suitable words:

We can see the sun about.............minutes before the actual sunrise and about.............minutes after the actual sunset because of atmospheric...............

 9

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

 10

Explain why, if we look at objects through the hot air over a fire, the objects appear to be moving (or shaking) slightly.