When you change from the medium power objective to the high power objective, what
should you do?

You must have the object centered before you change objectives to increase the magnification, because the field of view becomes smaller; if the object is off to the side, it may disappear when you go to higher magnification. ... The higher the power of the objective lens, the less will be the depth of field.

Explanation:

"a connection, a bond or common feeling between two people", or as a chemical process it stimulates love or sexual attraction

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.