If a beam of red light and a beam of violet light are incident at the same angle on the inclined surface of a prism from air medium and produce angles of refraction r and v respectively, which of the following is correct?

(A) r = v

(B) r > v

(C) r = 1/v

(D) r < v

 

Answer - 

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

 

The red light bends the least while the violet the most.

Angle of Refraction of Red and Violet Light - Teachoo.jpg

We can see from the figure that

  • Red bends the least , so it’s angle of refraction is lowest (i.e. r is lowest )
  • Violet bends the most , so it’s angle of refraction is highest (i.e. v is highest )

So, the correct answer is (d)

 

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About the Author

CA Maninder Singh's photo - Founder at Teachoo
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