Assertion (A): A white light on passing through  prism splits into its component colours as such  that the red light emerges nearest to the base of  the prism.  

Reason (R): Wavelength of red light is more than  other component colours and hence, red light deviates least.  

Answer

 

For assertion

  • The prism split the incident white light into 7 colors VIBGYOR -  Violet, Indigo, Blue, Green, Yellow, Orange and Red. 
  • Here, violet light emerges nearest to the base of the prism

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

 

For reasoning 

  • Wavelength is inversely proportional to the deviation in the path of the light.
  • Red has the highest wavelength and violet the least
  • Hence, red light deviates least .

Slide1.JPG

Thus,

  • The assertion is false
  • The reason is true

So, the correct answer is (d)

  1. Class 10
  2. Chapter 11 Class 10 - Human Eye and Colourful World (Term 1)

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