Part 1': Refraction First, calculate angles 0, D, and E. For simplicity, here are the formulas for them (although you should verify that they are true): C=A7D AA 0301 HIV D = tan1(X1/Y1) E : tan'1(X2/Y2) (7) Then, calculate the sines of these angles (and A). Keep in mind (for both of these calculations) the warning above. Note that, for both of these steps, we did the uncertainty propagation for you (because propagating uncertainty through trigonometric formulas is somewhat messy and uses specialized formulas that require calculus to motivate). Then, using those sines, calculate the index of refraction, assuming nah = 1, twice, once at each boundary (i.e., once using angles A and C, and once using angles D and E). Finally, answer the questions on the data sheet about whether these agree with the expected value for n.