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In a thin film of oil on water, which color will appear at the topmost layer if

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Question: In a thin film of oil on water, which color will appear at the topmost layer if the thickness of the film is such that it causes constructive interference for blue light?

Options:

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

Correct Answer: Blue

Solution: 

If the film thickness causes constructive interference for blue light, blue will be the color that appears most prominently.

In a thin film of oil on water, which color will appear at the topmost layer if

Practice Questions

Q1
In a thin film of oil on water, which color will appear at the topmost layer if the thickness of the film is such that it causes constructive interference for blue light?
  1. Red
  2. Green
  3. Blue
  4. Yellow

Questions & Step-by-Step Solutions

In a thin film of oil on water, which color will appear at the topmost layer if the thickness of the film is such that it causes constructive interference for blue light?
  • Step 1: Understand that a thin film of oil on water can create different colors due to interference of light.
  • Step 2: Know that constructive interference happens when light waves combine to make a brighter color.
  • Step 3: Identify that if the film thickness is right for blue light, it means blue light waves are reinforcing each other.
  • Step 4: Conclude that since blue light is being reinforced, it will be the most visible color at the topmost layer of the oil film.
  • Thin Film Interference – The phenomenon where light waves reflected from the top and bottom surfaces of a thin film interfere with each other, leading to constructive or destructive interference depending on the film's thickness and the wavelength of light.
  • Constructive Interference – Occurs when the path difference between two waves is an integer multiple of the wavelength, resulting in increased amplitude and brightness of the observed color.
  • Color Perception – The color observed in thin films is determined by the wavelengths of light that undergo constructive interference, which can vary with film thickness.
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