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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 is viewed in white light? (2022)

Options:

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

Correct Answer: Green

Exam Year: 2022

Solution: 

At the center of the thin film interference pattern, the color that appears is typically green due to the constructive interference of wavelengths in that range.

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 is viewed in white 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 is viewed in white light? (2022)
  • Step 1: Understand that a thin film of oil on water creates an interference pattern when light hits it.
  • Step 2: Know that white light is made up of many colors (like a rainbow).
  • Step 3: Realize that when light reflects off the top and bottom surfaces of the oil film, some colors will combine and others will cancel out.
  • Step 4: At the center of the pattern, certain wavelengths (colors) will constructively interfere, meaning they combine to make a brighter color.
  • Step 5: For a typical thin film of oil, the color that appears at the center is usually green due to this constructive interference.
  • 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 the appearance of different colors depending on the film's thickness and the angle of light.
  • Constructive Interference – Occurs when the path difference between two waves results in their peaks aligning, enhancing certain wavelengths of light, which can lead to specific colors being observed.
  • Color Perception in White Light – White light is composed of multiple wavelengths, and the specific colors seen in thin films depend on the constructive and destructive interference of these wavelengths.
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