What kind of telescope is shown in the figure below? Here the arrows show the path of light rays through the telescope and "F" labels the focus point. 
Definitions:
Passive Solar Design
A design philosophy that utilizes a building's orientation, window placement, and construction materials to minimize energy use by capturing and distributing solar energy naturally.
Adobe Walls
Walls made from a mixture of earth, water, and organic materials such as straw, shaped into bricks and dried in the sun, used in some building constructions.
Passive Solar System
A design approach that utilizes the sun's energy for the heating and cooling of living spaces by exposure to the sun, without active mechanical systems.
Active Solar System
An energy system that directly uses mechanical or electrical devices powered by sunlight, such as solar panels, to capture and convert solar energy.
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