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In a thin film of oil on water, which color will appear bright if the film thick

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Question: In a thin film of oil on water, which color will appear bright if the film thickness is such that destructive interference occurs for blue light?

Options:

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

Correct Answer: Red

Solution: 

If destructive interference occurs for blue light, the complementary color (red) will appear bright.

In a thin film of oil on water, which color will appear bright if the film thick

Practice Questions

Q1
In a thin film of oil on water, which color will appear bright if the film thickness is such that destructive interference occurs for 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 bright if the film thickness is such that destructive interference occurs for blue light?
  • Step 1: Understand that a thin film of oil on water can create different colors due to interference of light.
  • Step 2: Know that interference can be constructive (colors appear bright) or destructive (colors appear dim).
  • Step 3: Identify that if destructive interference occurs for blue light, it means blue light is canceled out.
  • Step 4: Remember that colors are complementary; the complementary color of blue is red.
  • Step 5: Conclude that if blue light is canceled out, the color that will appear bright is red.
  • 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.
  • Complementary Colors – Colors that, when combined, cancel each other out (e.g., blue and orange, red and cyan). In this context, if blue light undergoes destructive interference, its complementary color (red) will be more prominent.
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