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In a thin film of oil on water, what color will be seen if the film thickness is

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Question: In a thin film of oil on water, what color will be seen 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: 

Constructive interference for blue light indicates that blue will be the color seen due to the film thickness.

In a thin film of oil on water, what color will be seen if the film thickness is

Practice Questions

Q1
In a thin film of oil on water, what color will be seen 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, what color will be seen if the film thickness is such that it causes constructive interference for blue light?
  • Step 1: Understand what a thin film is. A thin film is a layer of liquid (like oil) that is very thin and sits on top of another liquid (like water).
  • Step 2: Learn about constructive interference. This happens when light waves combine in a way that makes certain colors brighter.
  • Step 3: Identify the color of light. In this case, we are focusing on blue light.
  • Step 4: Know that if the film thickness is just right, it will enhance the blue light through constructive interference.
  • Step 5: Conclude that if the film thickness causes constructive interference for blue light, then blue will be the color seen.
  • 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 thickness and 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 of Light – Different colors of light correspond to different wavelengths, with blue light having a shorter wavelength compared to other colors in the visible spectrum.
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