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

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Question: In a thin film of oil on water, which color will appear at the topmost layer if the film is of thickness comparable to the wavelength of blue light?

Options:

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

Correct Answer: Blue

Solution: 

The color that appears depends on the thickness of the film and the wavelength of light. Blue light has a shorter wavelength and will be more prominently reflected.

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

Practice Questions

Q1
In a thin film of oil on water, which color will appear at the topmost layer if the film is of thickness comparable to the wavelength of blue light?
  1. Red
  2. Green
  3. Blue
  4. Yellow

Questions & Step-by-Step Solutions

In a thin film of oil on water, which color will appear at the topmost layer if the film is of thickness comparable to the wavelength of blue light?
  • Step 1: Understand that a thin film of oil on water can create colorful patterns due to interference of light.
  • Step 2: Know that different colors of light have different wavelengths. Blue light has a shorter wavelength compared to other colors.
  • Step 3: Recognize that when light hits the thin film, some light reflects off the top surface and some light reflects off the bottom surface (the oil-water interface).
  • Step 4: Realize that the thickness of the oil film affects how these reflected light waves interact with each other.
  • Step 5: If the thickness of the oil film is similar to the wavelength of blue light, the blue light will be more prominently reflected.
  • Step 6: Conclude that the color that will appear at the topmost layer of the oil film 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 the appearance of different colors depending on the film's thickness and the wavelength of light.
  • Wavelength of Light – Different colors of light correspond to different wavelengths, with blue light having a shorter wavelength compared to other colors.
  • Reflection and Refraction – Understanding how light behaves when it encounters different media, which is crucial for analyzing the colors seen in thin films.
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