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In a thin film of oil on water, which color will appear at the center of the pat

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Question: In a thin film of oil on water, which color will appear at the center of the pattern if the film thickness is such that it causes constructive interference for red light? (2022)

Options:

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

Correct Answer: Red

Exam Year: 2022

Solution: 

The color that appears at the center of the pattern corresponds to the wavelength that experiences constructive interference, which in this case is red light.

In a thin film of oil on water, which color will appear at the center of the pat

Practice Questions

Q1
In a thin film of oil on water, which color will appear at the center of the pattern if the film thickness is such that it causes constructive interference for red light? (2022)
  1. Red
  2. Blue
  3. Green
  4. Yellow

Questions & Step-by-Step Solutions

In a thin film of oil on water, which color will appear at the center of the pattern if the film thickness is such that it causes constructive interference for red light? (2022)
  • Step 1: Understand that a thin film of oil on water can create colorful patterns due to light interference.
  • Step 2: Know that constructive interference happens when certain wavelengths of light reinforce each other.
  • Step 3: Identify that red light is the wavelength that is causing constructive interference in this scenario.
  • Step 4: Conclude that the color that will appear at the center of the pattern is red, since it is the wavelength that is being reinforced.
  • 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 the wavelength of light.
  • Constructive Interference – Occurs when the path difference between two waves is an integer multiple of the wavelength, resulting in an increase in amplitude and brightness of the observed color.
  • Wavelength of Light – Different colors of light correspond to different wavelengths, with red light having a longer wavelength compared to other visible colors.
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