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A light shelf improves daylighting by

  • A.increasing the glazed area of the facade
  • B.reducing the solar heat gain through the window
  • C.diffusing the light entering the window
  • D.reflecting light deeper into the room off the ceiling

Answer: D

A horizontal surface in the upper part of the window bounces light onto the ceiling and thence to the back of the room, while shading the area near the window that had too much. It improves the uniformity as much as the level.

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