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Mind thundering Questions?(Microscopy)

1.Why cathode is negative in physics and positive in chemistry?
                 In physics cathode is considered to be a source of electron which are driven by voltage,where as in chemistry cathode is a place for reduction where the electrons tries to be neutral by dissolving in positive holes in the electrode.

2.What is the difference between light scattering, reflection though they have the same phenomenon?
         Light reflection: Incident angle= Reflected angle
         Light refraction:Incident angle ≠ Reflected anlgle
                  

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