In which medium does the light move faster, water or diamond?

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

Why don't you see your reflection in water with waves or repples

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?