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Solution


Q.

Read the passage given below and answer the following questions from (i) to (v).

The spreading of light by the air molecules is called the scattering of light. The light having the least wavelength scatters more. The Sun appears red at sunrise and sunset and the sky appears blue. It is due to the scattering of light. The colour of the scattered light depends on the size of the particles. The amount of scattering of light depends on the wavelength of light. When light from the Sun enters the earth’s atmosphere, it gets scattered by the dust particles and the air molecules present in the atmosphere. The path of sunlight entering the dark room through a fine hole is seen because of the scattering of the sunlight by dust particles present in its path.

 

(iv) Twinkling of stars and non-twinkling of planets is accounted for by:
1 Atmospheric refraction  
2 Atmospheric scattering  
3 Total internal reflection  
4 Dispersion of light    

Ans.

(1)