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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.

 

(i) A prism PQM (QM as the base) is placed in four different orientations as shown in the figure below. A narrow beam of sunlight is incident on the prism (in all orientations).


In which case, after dispersion, the third colour from the top corresponds to the primary colour Blue
1 (i)  
2 (ii)  
3 (iii)  
4 (iv)  

Ans.

(3)