o sursa luminoasa punctiforma se afla pe axul optic al unei lentile cu distanta focala f=3cm la distanta x1=4cm de centrul optic alacesteia . De cealalta parte, la d=3cm, se afla o lentila identica cu prima. Cele doua lentile au acelasi ax optic. Unde se va forma imaginea sursei de lumina?

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stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.