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Solution


Q.

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

Splitting of white light into its seven constituent colours when passed through a glass prism is known as dispersion. All the colours travel at the same speed when they travel in vacuum. But when they pass through a medium, such as a glass prism, the colours bend or refract at different angles, and therefore the speed changes. Red colour bends the least and violet deviates the most.

 

(v) Red colour is selected for danger signals because:
1 Red light has the highest speed among all colours so it reaches our eyes fast.  
2 Since red is the colour of human blood so it is directly associated with danger and courage.  
3 Highest frequency of the colour red makes the wave move repeatedly multiple times in a direction.  
4 Red light has the highest wavelength among all colours so it is scattered least.  

Ans.

(4)