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Solution


Q.

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

Different colours in the white light travel at the same speed in a vacuum for all wavelengths. But in any transparent medium (glass or water), the light of different colours travel with different speeds for different wavelength. This means that the refractive index of a particular material is different for different wavelengths. As there is a difference in their speeds, the different colours bend through different angles. The speed of violet colour is maximum and the speed of red colour is minimum in the glass. Hence, red colour deviates the least and violet the most. The relationship is – higher the wavelength of a colour of light, smaller is the refractive index and less is the bending of light.

 

(i) Which of the following statements is correct regarding the propagation of light of different colours of white light in the air
1 Red light moves fastest.  
2 Blue light moves faster than green light.  
3 All the colours of the white light move at the same speed.  
4 Yellow light moves with the mean speed as that of the red and violet light.  

Ans.

(3)