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In thin film interference, if the refractive index of the film is greater than t

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Question: In thin film interference, if the refractive index of the film is greater than that of the surrounding medium, what happens to the phase of the reflected wave?

Options:

  1. No phase change
  2. Phase change of π
  3. Phase change of 2π
  4. Phase change of λ

Correct Answer: Phase change of π

Solution: 

When light reflects off a denser medium, it undergoes a phase change of π (180 degrees).

In thin film interference, if the refractive index of the film is greater than t

Practice Questions

Q1
In thin film interference, if the refractive index of the film is greater than that of the surrounding medium, what happens to the phase of the reflected wave?
  1. No phase change
  2. Phase change of π
  3. Phase change of 2π
  4. Phase change of λ

Questions & Step-by-Step Solutions

In thin film interference, if the refractive index of the film is greater than that of the surrounding medium, what happens to the phase of the reflected wave?
  • Step 1: Understand that thin film interference involves light waves reflecting off different surfaces.
  • Step 2: Identify the film as a layer of material with a refractive index greater than the surrounding medium.
  • Step 3: Recognize that when light hits a boundary between two materials, it can reflect back.
  • Step 4: Note that if light reflects off a denser medium (higher refractive index), it experiences a phase change.
  • Step 5: Conclude that this phase change is π (180 degrees), meaning the wave is inverted.
  • 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.
  • Phase Change upon Reflection – When light reflects off a medium with a higher refractive index, it experiences a phase shift of π (180 degrees).
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