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If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this