Yellow Light Is Viewed by Reflection from a Thin Vertical $\lambda$

question 7

Multiple Choice

Yellow light is viewed by reflection from a thin vertical soap film. Let $\lambda$ be the wavelength of the light within the film. Why is there a large dark space at the top of the film?

• A) no light is transmitted through this part of the film
• B) the film thickness there is \(\lambda\)/4
• C) the light reflected from exactly one of the two surfaces undergoes a 180 \(\degree\) phase change
• D) the film is too thick in this region for thin film formulas to apply
• E) the reflected light is in the infrared

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