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Q. A tank of water sits at the edge of a table of height 1.30m. The tank springs a very small leak at its base, and water sprays out a distance of 0.7 m from the edge of the table. What is the water level h in the tank? (Suppose the tank is open to the air at the top.)

Q. What is the least (non-zero) thickness for the air layer between two flat, and parallel, glass surfaces if the glass is to appear dark while 640 nm light is incident normally? What if the glass is to appear bright?

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