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JAMB Physics 1997 Question 30

Question 30

Waves

The colours seen in thin films of oil on the road and in soap bubbles are due to

  1. A.reflection
  2. B.interference
  3. C.diffraction
  4. D.polarization
Show the answer and explanation

Answer: B (interference)

Explanation

Light reflected from the top and bottom of the thin film overlaps. Some colours add up and others cancel, depending on the film's thickness: this is interference.