Question

SHORT ANSWER TYPE QUESTIONS
1. Why do stars twinkle at night?
2. Describe the formation of rainbow in the sky with the help of a diagram.
3. Why the sun appear red while sunset and sunrise ? Explain.
4. Why do stars seem higher than they actually are ? Illustrate your answer with
the help of a diagram.
LONG ANSWER TYPE QUESTIONS
1. What is almospheric refraction ? What causes almospheric refracijon ?
2. Draw a neat and labelled diagram of the experimental set-up for observing
the scattering of light in a colloidal solution of selphur to show how the sky
appears blue and the sun appears red at sunrise and sunset.
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Answer 1

Answer:

1) Why do stars twinkle at night?

The movement of air (sometimes called turbulence) in the atmosphere of Earth causes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. ... To our eyes, this makes the star seem to twinkle.

2) Describe the formation of rainbow in the sky with the help of a diagram.

It is formed due to dispersion of sunlight through water droplets. Water droplets act as small prism through which sunlight enters it refracts and disperses and then gets reflected internally which creates a rainbow in the sky which is seen to observer's eye