A lens has a focal length of 60 cm in air.If this lens were immersed in water, what focal length would result? The index of refraction of the lens is 1.500 and that of water is 1.333.The focal length of a thin lens with index n1 submerged in a liquid with index n2 is given by the modified lens maker's formula: 
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Definitions:
Production Efficiency
A situation where the economy is utilizing all of its resources efficiently, producing what people want at the lowest possible cost.
Production Possibility Frontier
Describes the maximum possible output combinations of two goods or services an economy can achieve when all resources are fully and efficiently utilized.
Unemployment Rate
The percentage of the labor force that is jobless and actively looking for employment.
Ppf
Production Possibility Frontier, a curve depicting all maximum output possibilities for two or more goods given a set of inputs.
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