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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 destructive interference for red light? (2022)

Options:

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

Correct Answer: Blue

Exam Year: 2022

Solution: 

Destructive interference for red light means red light is canceled out, leaving the shorter wavelengths (blue) visible.

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 destructive interference for red light? (2022)
  1. Blue
  2. Green
  3. Yellow
  4. Red

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 destructive interference for red light? (2022)
  • Step 1: Understand that a thin film of oil on water can create colorful patterns due to interference of light.
  • Step 2: Know that interference can be constructive (light adds up) or destructive (light cancels out).
  • Step 3: Recognize that destructive interference for red light means that red light is canceled out and does not appear.
  • Step 4: Identify that shorter wavelengths of light, like blue, will be visible when red is canceled out.
  • Step 5: Conclude that if red light is canceled out, the color that will appear at the center of the pattern is 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 thickness and wavelength of light.
  • Destructive Interference – Occurs when two waves combine in such a way that their amplitudes cancel each other out, resulting in a reduction or elimination of the light intensity for specific wavelengths.
  • Wavelength and Color – Different colors of light correspond to different wavelengths, with red light having a longer wavelength and blue light having a shorter wavelength.
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