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

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Question: In a thin film of oil on water, what color will be seen if the film is of thickness corresponding to destructive interference for blue light?

Options:

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

Correct Answer: Red

Solution: 

Destructive interference for blue light means blue light is canceled out, allowing longer wavelengths (like red) to be seen.

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

Practice Questions

Q1
In a thin film of oil on water, what color will be seen if the film is of thickness corresponding to destructive 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 is of thickness corresponding to destructive interference for blue light?
  • Step 1: Understand that a thin film of oil on water can create interference patterns with light.
  • Step 2: Know that interference can be constructive (light adds up) or destructive (light cancels out).
  • Step 3: Recognize that destructive interference for blue light means that blue light waves are canceled out.
  • Step 4: Since blue light is canceled, we will not see blue in the reflection.
  • Step 5: Understand that longer wavelengths of light, like red, will still be visible.
  • Step 6: Conclude that if blue light is canceled out, the color we will see is red or other longer wavelengths.
  • 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.
  • Destructive Interference – Occurs when two light waves combine in such a way that they cancel each other out, resulting in a reduction or elimination of light of certain wavelengths.
  • Wavelength and Color Perception – Different wavelengths of light correspond to different colors; longer wavelengths appear red, while shorter wavelengths appear blue.
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