How does the electrical force relate to the distance between two charged objects? it is inversely proportional to the square of the distance. it is directly proportional to the square of the distance. it is inversely proportional to the distance. it is directly proportional to the distance.

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?