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

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Question: In a thin film interference experiment, what type of interference occurs when light reflects off a denser medium? (2023)

Options:

Correct Answer: Destructive interference

Exam Year: 2023

Solution:

When light reflects off a denser medium, a phase change of π occurs, leading to destructive interference for certain path differences.

In a thin film interference experiment, what type of interference occurs when light reflects off a denser medium? (2023)

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.

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 denser medium, it undergoes a phase change of π (or 180 degrees), which affects the interference pattern.
Destructive Interference – Occurs when the path difference between two waves leads to them being out of phase, resulting in cancellation of the waves.