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They take advantage of a concept called Snells window, which is how the refractive properties of water affect how fish see the world above the surface
Again these distance can all be estimated by looking at the scales along the left and top of the graph
Often in meters rather than feet, the depth should be clear and fairly accurate, with the accuracy depending on the specific fish finder model that you purchase
Suggested Lab Procedures The teacher might consider assigning the "physical pendulum" method to half of the student lab groups and the "rolling down an incline" method to the other half
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