Psychosis is: A. talking with a therapist.
B. a mental state that involves problems perceiving reality and
problems with thinking and feeling.
C. the process of using medication to get better.
D. thinking you are sick or have a disease when you really do not.

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?