You now immerse the interferometer in a tank filled with some unknown liquid and carefully align the laser into the interferometer. you move the mirror until you count 100.0 fringes passing the crosshairs of the telescope. the micrometer indicates that the mirror has moved 0.02381 millimeters. what is the index of refraction for this mystery fluid

During the 1800s. hope this !

Did you ever figure out the right answers since you asked?

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.

Electric force between two charged object varies inversely as the square of distance between them (coulomb's law). this means if two charged objects move away force between them decreases.