An elderly sailor is shipwrecked on a desert island but manages to save his eyeglasses. The lens for one eye has a power of +1.24 diopters, and the other lens has a power of +8.83 diopters. What is the magnifying power of the telescope he can construct with these lenses? Tries 0/20 How far apart are the lenses when the telescope is adjusted for minimum eyestrain?

Protons have a positive charge and, collectively, give an element its atomic number.

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.