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In a thin film of oil on water, which color of light is most likely to be reflec

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Question: In a thin film of oil on water, which color of light is most likely to be reflected? (2022)

Options:

  1. Red
  2. Blue
  3. Green
  4. Yellow

Correct Answer: Blue

Exam Year: 2022

Solution: 

Due to the phenomenon of thin film interference, the color that is most prominently reflected depends on the thickness of the film and the wavelength of light. Typically, blue light is more likely to be reflected due to shorter wavelengths.

In a thin film of oil on water, which color of light is most likely to be reflec

Practice Questions

Q1
In a thin film of oil on water, which color of light is most likely to be reflected? (2022)
  1. Red
  2. Blue
  3. Green
  4. Yellow

Questions & Step-by-Step Solutions

In a thin film of oil on water, which color of light is most likely to be reflected? (2022)
  • Step 1: Understand that a thin film of oil on water can create colorful patterns due to light interference.
  • Step 2: Know that different colors of light have different wavelengths. Blue light has a shorter wavelength compared to other colors.
  • Step 3: Recognize that when light hits the thin film, some light reflects off the top surface and some goes through and reflects off the bottom surface.
  • Step 4: Realize that the thickness of the oil film affects which colors are reflected more strongly.
  • Step 5: Conclude that shorter wavelengths, like blue light, are more likely to be reflected prominently in thin films.
  • Thin Film Interference – The phenomenon where light waves reflected from the top and bottom surfaces of a thin film interfere with each other, affecting the colors observed.
  • Wavelength Dependence – Shorter wavelengths of light, such as blue, are more likely to be reflected in thin films due to their interaction with the film's thickness.
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