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 below Figure. In which of the following diagrams, after dispersion, the third colour from the top of the spectrum corresponds to the colour of the sky?

Question 24 - A prism ABC (with BC as base) is placed in different orientations - Teachoo.jpg

A. (i)

B. (ii)

C. (iii)

D. (iv)

 

Answer - 

dispersion-of-white-light-in-glass-prism---teachoo.jpg

  • When white light passes from prism, it is dispersed as VIBGYOR
  • And, color of the sky is blue

 

In this question , we want the case where Blue is the 3rd color from top.

  • In a normal prism, 3rd color from top is Yellow
  • But, in an i nverted prism , 3rd color from top is Blue. Thus, image (ii) is correct

Splitting of light in prism is kept in different orientation-01.jpg

So, the correct answer is (b)  

 

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo