If possible, personnel who own the system or are responsible for its security should perform the va because they know the ins and outs of the system better than any outsider a. trueb. false

are there answer choices to this question? this seems like a question where you have options to choose from.

probably not if net force is zero

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray

snell's law

refractve index = sin incidence / sin refraction