A Person Can Read the Newspaper When It Is Held

question 39

Multiple Choice

A person can read the newspaper when it is held at 60 cm from his eyes.What should the focal length of his contact lenses be to allow him to read the newspaper comfortably at a distance of 30 cm?

• A) -30 cm
• B) 30 cm
• C) -60 cm
• D) 60 cm
• E) 90 cm

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Definitions:

Energy Efficiency

The practice of using less energy to provide the same service or achieve the same result.

Green Roofs

Rooftops covered with vegetation and soil or a growing medium, installed over a waterproof membrane, to improve building insulation, reduce urban heat islands, and create habitats.

Geothermal Heat Pumps

Systems that use the stable underground temperature to provide heating, cooling, and hot water for buildings.