Consider your work on Problem 25.59. Did the light flip (change phase by 180°) when it reflected off of either of the boundaries? Yes. Light flipped when it reflected off the top surface of the soap (going from air toward soap) O Yes. Light flipped when it reflected at the bottom surface (going from soap toward air) O Yes. Light flipped when it reflected off of both the top and bottom of the soap layer O No. Light did not flip at either interface

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Q: Thank you! could you solve question 9 as well, I will be sure to specify next time

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Q: what is the answer to b)?

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Speed of light

The speed at which the light travels in a vacuum is unbiased for both the source and inertial frame of reference of the observer. This was postulated by the physicist, Albert Einstein, by observing the theory of electromagnetism of Maxwell. Also, there was no evidence for the luminiferous aether, that is, the medium for the propagation of light where the electromagnetic field exists.