Q22 of 30 Page 88

Why do we see a rainbow in the sky only after rainfall?

We see rainbow in the sky only after rainfall due to dispersion of sunlight by the tiny water droplets of rain present in the atmosphere. The water droplets acts like small prisms. The rain drops are refracted, dispersed and reflected internally and then refracted again. Due to these phenomena, we see a rainbow in the sky after rainfall.


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20

Draw a ray diagram showing the dispersion through a prism when a narrow beam of white light is incident on one of its refracting surfaces. Also indicate the order of the colours of the spectrum obtained.

 21

Is the position of a star as seen by us its true position? Justify your answer.

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Why is the colour of the clear sky blue?

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What is the difference in colours of the Sun observed during sunrise/sunset and noon? Give explanation for each.