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In a thin film of oil on water, what color will be seen if the film thickness is

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Question: In a thin film of oil on water, what color will be seen if the film thickness is such that destructive interference occurs for blue light? (2021)

Options:

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

Correct Answer: Red

Exam Year: 2021

Solution: 

If destructive interference occurs for blue light, the color seen will be the complementary color, which is red.

In a thin film of oil on water, what color will be seen if the film thickness is

Practice Questions

Q1
In a thin film of oil on water, what color will be seen if the film thickness is such that destructive interference occurs for blue light? (2021)
  1. Red
  2. Green
  3. Blue
  4. Yellow

Questions & Step-by-Step Solutions

In a thin film of oil on water, what color will be seen if the film thickness is such that destructive interference occurs for blue light? (2021)
  • 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 add up) or destructive (colors cancel out).
  • Step 3: Identify that if destructive interference occurs for blue light, it means blue light is canceled out.
  • Step 4: Learn about complementary colors: the color opposite to blue on the color wheel is red.
  • Step 5: Conclude that if blue light is canceled out, the color that will be seen 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, produce a neutral color (white or gray). In this context, the complementary color of blue is red.
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