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Discussion

The information of brilliant colors in a thin soap film is a consequence of the phenomena of

  • A.Polarization and interference
  • B.Diffraction and dispersion
  • C.Multiple refraction and dispersion
  • D.Multiple reflection and interference

Answer: D

The colours arise from multiple reflection and interference.

Light reflected from the front surface of the film and light reflected from the back travel different distances and interfere. The path difference depends on both thickness and wavelength, so different colours cancel or reinforce at different points, giving the shifting bands.

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