Physics

__**RERFRACTIVE INDEX**__ = Physics: Refractive index of Westlake = Aim: To determine how light is affected when passing through westlake water vs. clean water. __** Equipments **__ __** Method **__ 1) Draw the medium, which is the length of the plastic box on a piece of paper 2) Pour West Lake Water into the plastic box after drawing the medium without moving the box 3) Use light ray box to let the ray from the light box pass through plastic box 4) Draw the reflected ray and refracted ray (make sure that the incidence ray and reflected ray is the same). 5) Measure the angle of incidence and angle of refraction (measure from ray to normal). 6) Collect data 7) Repeat step 1 - 6 for 3 other different sources of water (Tap Water, Drinking Water, Distilled Water).
 * Hypothesis: The more polluted the water, the denser the water and hence the light bends more underwater, which also means that the more polluted the water the higher the refractive index. **
 * Based on observation: The water color on Westlake is different compare to other normal water with normal color (e.g. drinking water, tap water ..etc.) If hypothesis is proved, we can conclude that the water in Westlake is polluted because the different color in water represents the density of the water. **
 * 1) 1 30 cm ruler
 * 2) 1 pen/pencil
 * 3) 1 light ray box
 * 4) 1 plastic box
 * 5) 4 pieces of paper

__** Some Observation made while Collecting Data  **__ It is harder for light to travel through polluted water compare to when light travel travel through other sources of water. When I did the experiment for polluted water, the light travels in the water and through to other side of the plastic box is much dimmer compare to that of other sources of water. This shows that the polluted water is more dense thus making it harder for the light to travel.