Could anyone explain what happens in the following light transmission experiment. Take two corrugated roof tiles and make a 5 to 6 inches hole on the center of each tile. The first tile you use just with the plain hole . In the second tile you adapt a transparent PET 2 litres COKE bottle, so that the bottle has its upper half left to the outside and the bottom half to the inner side. You cement the bottle with epoxy firmly to the tile, and fill it with tap water. Mount the tiles on a roof of an enclosed room/area covering any oyher source of light. Observing both tiles side by side, from the enclosed side we get the impression that the tile with the bottle transmitts say twice the light as the tile with bare hole. The bottle without water transmitts less light. TIA drk
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