Light is just a form of energy.Let light fall on a Solar Cell.and then we can get that light energy again and re-use it.Easy.But we should keep one THING in my mind because we loose some of this energy1) Due to INEFFICIENCY of photovoltaic cells(we may only increase it to a certain LEVEL only)2)We loose it in the form of heat from the wires.3)We again loose some of it due to internal resistance offered by the battery that STORES the energy.
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