Part 1: Basic Refraction In this part, we are going to measure all of our angles by measuring distances. This will enable us to measure them with a reasonable degree of precision. The angles and distances we will look at _ are shown in the following diagrams. Red lines are the laser beams; in the left diagram, blue lines are normals. (Note Y2 extends downwards to the location of the light beam at that x-coordinate.) A B C D Y , X , E Y, 50Part I: Refraction First, calculate angles 0, D, and E. For simplicity, here are the formulas for them (although you should verify that they are true): 0: AD (5) D = tan'1(X1/Y1) (6) E = tan'1(X2/Yz) (7)