What is an advantage to using confocal fluorescence imaging over conventional fluorescence imaging?

Answer and Explanation:

Confocal fluorescence imaging's advantages over conventional fluorescence imaging include the capability to collect serial optical sections from thick specimens, elimination or reduction of background information away from the focal plane (that leads to image degradation) and the ability to control depth of field.

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

wavelength divides in half and speed stays the same.