question_answer

A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in figure. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?

A) (i)                                

B) (ii)                    

C) (iii)                   

D)        (iv)

Correct Answer: B

Solution :

Out of the following orientations, figure (ii) represents the case in which, after dispersion, the third colour from the top is blue i.e. colour of the sky.