Jennifer and Janna are trying to figure out how to control the mouse problem in their horse barn. They have tried several types of traps baited with peanut butter with no luck. The girls decide that the problem might not be the type of trap; it might be the type of food. What is the BEST question for the girls to use on their next experiment?

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?