In thin film interference, what causes a phase change of π?
Correct Answer: When a wave reflects off a denser medium.
- Step 1: Understand that light behaves like a wave.
- Step 2: Know that when light hits a surface, some of it reflects back.
- Step 3: Identify that there are different materials, some are denser than others (like air to glass).
- Step 4: Recognize that when light reflects off a denser medium, it undergoes a phase change.
- Step 5: A phase change of π means the wave is flipped upside down.
- Step 6: Conclude that this phase change happens specifically when reflecting off a denser medium.
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