Which colour among the seven colours of the white light gets most deviated after dispersion of light through a glass prism?

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RRB JE CBT I - (Held On: 31 May 2019 Shift 1)
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  1. Red
  2. Violet 
  3. Indigo
  4. Orange

Answer (Detailed Solution Below)

Option 2 : Violet 
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The correct answer is Violet

Key Points

  • Violet light gets most deviated after dispersion of white light through a glass prism.
  • Dispersion occurs because different colors of light have different wavelengths and hence, different refractive indices when passing through the prism.
  • Violet light has the shortest wavelength among the visible spectrum, leading to a higher refractive index and greater deviation.
  • The order of deviation from least to most is: Red, Orange, Yellow, Green, Blue, Indigo, and Violet.

Additional Information

  • Dispersion is the phenomenon where white light splits into its constituent colors when passing through a medium like a prism.
  • The prism causes each wavelength of light to refract at different angles due to varying speeds in the glass medium.
  • Isaac Newton was the first to demonstrate the dispersion of light through a prism.
  • Understanding light dispersion is crucial in fields such as optics, photography, and even in understanding natural phenomena like rainbows.
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