Abeam of light, which is traveling in air, is reflected by a glass surface. does the reflected beam experience a phase change, and if so, by how much is the phase of the beam changed?

180 degree phase change

Explanation:

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

the higher the current the higher the mag field around it the higher the influence on the compass