What is the least thickness of a soap bubble film n 1.38, Ask an Expert

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Q. What is the minimum thickness of a soap bubble film (n = 1.38) on which light of wave length 610 nm shines, assuming one observes constructive interference of the reflected light?

Q. A 50 thick layer of oil floats on a 120 thick layer of water.What is the pressure at the bottom of the water layer?

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