Q5 of 13 Page 411

Name the atmospheric phenomenon due to which the sun can be seen above the horizon about two minutes before actual sunrise.

The phenomena is called refraction of light. Due to change in refractive index(property of the medium) of the atmosphere of earth the light bends when it goes from one medium to another medium because the change in speed of light in different mediums and due to this it bends and we see the sun before and after actual sunrise and sunset.

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More from this chapter

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3

A person is advised to wear spectacles with concave lenses. What type of defect of vision is he suffering from?

 4

A person can comfortably read a book but finds it difficult to read the number on a bus parked 5 m away from him. Name the type of defect of vision he is suffering from. Which type of lens should be used in his spectacles to correct his vision?

 6

Name the defect of vision caused by

(i) Excessive curvature of cornea


(ii) Power of accommodation of eye decreases.

 7

What is the colour of the clear sky during daytime? Give reason for it.