Why does dispersion occur when white light which is a mixture of seven colours passes through a glass prism?

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RRB JE Previous Paper 14 (Held On: 26 May 2019 Shift 3)
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  1. 7 colours of white light travels at different speeds through a glass prism
  2. 7 colours are refracted at same speed.
  3. 7 colours are reflected by prism
  4. The white light scatters the 7 colours throughout the prism

Answer (Detailed Solution Below)

Option 1 : 7 colours of white light travels at different speeds through a glass prism
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CONCEPT:

Set 9 Om 20Q -Hindi.docx 3

  • Dispersion of light: The splitting of a composite beam of light into its constituent colors is called dispersion of light. 
    • The dispersion of white light occurs because the colors of white light travel at different speeds through the glass prism.
    • The dispersion was discovered by Sir Issac Newton.
    • Newton discovered that light is made up of seven different colors.

EXPLANATION:

  • The dispersion of white light occurs because colors of white light travel at different speeds through the glass prism. So option 1 is correct.
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