A converging lens with a focal length of 12 cm produces a 3-cm high virtual image of a 1-cm high object. Which entry in the table below is correct? 
Definitions:
Socially Efficient
A condition where resources are allocated in a way that maximizes the overall benefit to society, taking into account all externalities.
Marginal Revenue
The additional income obtained from selling one more unit of a good or service, critical in determining the optimal level of production for a firm.
Profits Maximize
The process or strategy by which a firm seeks to achieve the highest possible return or benefit from its operations and resources.
Monopolist
A single seller in a market who has significant control over the prices and supply of a product or service.
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