1.

A 4.0 cm thick water layer (μ-4/3) rests on a 6.0 cm layer of CCL (μ-1.5) in atank. How far below the water surface, viewed normally from above, does thebottom of the tank seem to be(1) 7.0 cm(2) 8.0 cm(3) 9.0 cm(4) 10.0 cm.

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