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In a thin film of oil on water, which color of light will be most prominently re

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Question: In a thin film of oil on water, which color of light will be most prominently reflected if the film thickness is such that it causes constructive interference?

Options:

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

Correct Answer: Blue

Solution: 

The color that is most prominently reflected depends on the thickness of the film and the wavelength of light. Typically, shorter wavelengths (like blue) are more affected by thin films.

In a thin film of oil on water, which color of light will be most prominently re

Practice Questions

Q1
In a thin film of oil on water, which color of light will be most prominently reflected if the film thickness is such that it causes constructive interference?
  1. Red
  2. Green
  3. Blue
  4. Yellow

Questions & Step-by-Step Solutions

In a thin film of oil on water, which color of light will be most prominently reflected if the film thickness is such that it causes constructive interference?
  • Step 1: Understand that a thin film of oil on water can reflect light.
  • Step 2: Know that different colors of light have different wavelengths.
  • Step 3: Recognize that constructive interference happens when certain wavelengths of light reinforce each other.
  • Step 4: Realize that thinner films tend to affect shorter wavelengths (like blue) more than longer wavelengths (like red).
  • Step 5: Conclude that if the film thickness is right for constructive interference, the color that will be most prominently reflected is likely to be blue.
  • 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.
  • Wavelength Dependence – Shorter wavelengths (like blue light) are more likely to experience constructive interference in thinner films, while longer wavelengths (like red light) may require thicker films for similar effects.
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