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This example PIN photodiode seems to be sensitive to IR and visible light, and has a parameter
$$ $ \frac{1}{2}$$$
After speaking to Dr. Morin about the structure of Physics 90r, it seems that at the beginning, there is some form that the student fills out indicating they have spoken to their advisor about expectations, and at the conclusion of the semester Dr. Morin reaches out to that person for a grade. So, the agreement is entirely between the student and the PI.