17. The picture shows a coin resting on the bottom ofa beaker filled with an unknown liquid. A ray of light reflected bv the coin
17. The picture shows a coin resting on the bottom ofa beaker filled with an unknown liquid. A ray of light reflected bv the coin travels to the surface of the liquid and is refracted as it enters the air, travelling parallel to the liquid-air boundary,r and into the viewer's eye as shown. How fast is the light travelling in the liquid? [A 6 marks]
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