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In a thin film of oil on water, which color will appear at the topmost layer whe

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Question: In a thin film of oil on water, which color will appear at the topmost layer when viewed from above?

Options:

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

Correct Answer: Red

Solution: 

The color that appears depends on the thickness of the film and the wavelength of light. Typically, red light is least affected by thin film interference.

In a thin film of oil on water, which color will appear at the topmost layer whe

Practice Questions

Q1
In a thin film of oil on water, which color will appear at the topmost layer when viewed from above?
  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 topmost layer when viewed from above?
  • Step 1: Understand that a thin film of oil on water can create different colors due to light interference.
  • Step 2: Know that light is made up of different colors, each with its own wavelength (like red, blue, green).
  • Step 3: Realize that when light hits the oil film, some light reflects off the top surface and some goes through to the water and reflects back.
  • Step 4: Understand that the thickness of the oil film affects how these reflected light waves interact with each other.
  • Step 5: Remember that red light has a longer wavelength and is less affected by the interference compared to other colors.
  • Step 6: Conclude that when you look at the topmost layer of the oil film, red light is usually the color that appears.
  • Thin Film Interference – The phenomenon where light waves reflected from the top and bottom surfaces of a thin film interfere with each other, affecting the colors observed.
  • Wavelength Dependence – Different wavelengths of light (colors) are affected differently by the thickness of the film, with longer wavelengths (like red) being less affected.
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