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If a thin film of oil on water produces a green color due to interference, what

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Question: If a thin film of oil on water produces a green color due to interference, what can be inferred about the thickness of the film? (2023)

Options:

  1. It is very thick
  2. It is very thin
  3. It is of variable thickness
  4. It is equal to the wavelength of green light

Correct Answer: It is very thin

Exam Year: 2023

Solution: 

Thin films produce colors due to interference; a green color indicates a thin film where the thickness is comparable to the wavelength of visible light.

If a thin film of oil on water produces a green color due to interference, what

Practice Questions

Q1
If a thin film of oil on water produces a green color due to interference, what can be inferred about the thickness of the film? (2023)
  1. It is very thick
  2. It is very thin
  3. It is of variable thickness
  4. It is equal to the wavelength of green light

Questions & Step-by-Step Solutions

If a thin film of oil on water produces a green color due to interference, what can be inferred about the thickness of the film? (2023)
  • Step 1: Understand that thin films can create colors through a process called interference.
  • Step 2: Recognize that the color seen (in this case, green) is related to the thickness of the film.
  • Step 3: Know that visible light has wavelengths, and the thickness of the oil film is similar to these wavelengths.
  • Step 4: Conclude that since green is observed, the thickness of the oil film must be comparable to the wavelength of green light.
  • Thin Film Interference – The phenomenon where light waves reflected from the top and bottom surfaces of a thin film interfere with each other, producing colors based on the film's thickness and the wavelength of light.
  • Wavelength of Visible Light – The range of wavelengths of light that are visible to the human eye, typically from about 400 nm (violet) to 700 nm (red).
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