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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 film thickness 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 at the topmost layer.

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 film thickness 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 film thickness 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 experiencing constructive interference, blue will be the color seen at the topmost layer.
  • 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.
  • Wavelength and Color – Different colors of light correspond to different wavelengths, with blue light having a shorter wavelength compared to other visible colors.
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