The coloured light that refracts most while passing through a prism is

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  1. yellow
  2. violet
  3. blue
  4. More than one of the above
  5. None of the above

Answer (Detailed Solution Below)

Option 2 : violet
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BPSC TRE Primary Teacher CT 1: भारतीय राष्ट्रीय आंदोलन (1857 का विद्रोह)
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Detailed Solution

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CONCEPT:

Dispersion of light:

Set 9 Om 20Q -Hindi.docx 3

  • Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours on passing through a prism.
  • The band of seven colours so obtained is called the (visible) spectrum.
  • The dispersion of white light occurs because the colours of white light travel at different speeds through the glass prism.

EXPLANATION:

  • As we know, bending of light is inversely proportional to the wavelength of the light.  

\(Bending\;\alpha \;\frac{1}{{Wavelength}}\)

  • Different colours bend differently on passing through a prism and the bending of colour depends on wavelength.
  • Higher wavelengths bend less, whereas shorter wavelength bend more.

Set 9 Om 20Q -Hindi.docx 1

  • Out of all violet has the least wavelength and hence it bends the most and red has the highest wavelength, so it bends the least. Therefore option 2 is correct.
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