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                                    13.A small coin is resting on the bottom of a beaker filled with a liquid A Ray of light from the queen travel up to the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid? | 
                            
| Answer» 13.A small coin is resting on the bottom of a beaker filled with a liquid A Ray of light from the queen travel up to the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid? | |