Any curved path followed by the laser will be due to the refractive index of the air in its path. Any curve in the string will be due to sag in the strinf. The reason is because the strings, like the lasers in your experiment, will not be following the geodesic of the earth. The sum of the angles along the string should come to 180° (± experimental error). The angles should be 90° and add to 270° (± experimental error).Īttach your pencils or dowels at the dots, assuring they are each standing perpendicular to the ball at their respective locations and of the same height.Īttach a string to the tops of each dowel, taking care to ensure the string attaches to the top centers (glue is fine for this application) and measure the angles of the triangle formed by the string along their length. Mark out three dots on the ball, one at a pole, the second, at the equator, and the third, 1/4 of the ball's circumference from the second dot along the equator.ĭraw the geodesics on the surface of the ball connecting each dot. But you can test your idea with a large ball of some sort, some glue, three pencils or dowels, a marker, a ruler, protractor, and string. Your experiment will not work because the lasers will not be following the curvature of the ground.
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