In a thin film interference experiment, what type of interference occurs when li

Practice Questions

Q1
In a thin film interference experiment, what type of interference occurs when light reflects off a denser medium? (2023)
  1. Constructive interference
  2. Destructive interference
  3. No interference
  4. Total internal reflection

Questions & Step-by-Step Solutions

In a thin film interference experiment, what type of interference occurs when light reflects off a denser medium? (2023)
  • Step 1: Understand that light can reflect off surfaces, and this can cause interference patterns.
  • Step 2: Identify that a denser medium is one where light travels slower, like glass compared to air.
  • Step 3: Recognize that when light reflects off a denser medium, it undergoes a phase change of π (which is equivalent to 180 degrees).
  • Step 4: Know that this phase change affects how the light waves combine when they meet again after reflecting.
  • Step 5: Realize that the phase change can lead to destructive interference, which means the waves can cancel each other out for certain distances.
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