In thin film interference, what causes a phase change of π?

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Question: In thin film interference, what causes a phase change of π?

Options:

Correct Answer: Reflection from a denser medium

Solution:

A phase change of π occurs when a wave reflects off a denser medium.

In thin film interference, what causes a phase change of π?

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.

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 a light wave reflects off a medium that is denser than the one it is traveling in, it undergoes a phase change of π (or 180 degrees).