For minimum deviation inside the prism the angle of emergence should be equal to ​

Explanation:

When a ray of light suffers minimum deviation through prism, angle of incidence is equal to the angle of emergence. Ray of light passing through the prism will be parallel to the base of the prism. Angle of refraction inside the material of the prism is half the angle of the prism.

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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.