In a thin film interference, if the film is denser than the medium it is placed

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Question: In a thin film interference, if the film is denser than the medium it is placed in, what happens to the phase of the reflected wave?

Options:

Correct Answer: Phase change of π

Solution:

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

In a thin film interference, if the film is denser than the medium it is placed in, what happens to the phase of the reflected wave?

In a thin film interference, if the film is denser than the medium it is placed in, what happens to the phase of the reflected wave?

Step 1: Understand that thin film interference involves light waves reflecting off surfaces.
Step 2: Identify the two media involved: the thin film and the medium it is placed in.
Step 3: Determine the density of the thin film compared to the medium. In this case, the film is denser.
Step 4: Recall the rule for reflection: when light reflects off a denser medium, it experiences a phase change.
Step 5: Conclude that the phase change is π (180 degrees) when light reflects off the denser film.

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 boundary where the second medium is denser than the first, it experiences a phase shift of π (180 degrees).