A lecture hall is a large room used for instruction, typically at a college or university. Unlike a traditional classroom with a capacity from one to four dozen, the capacity of lecture halls is typically measured in the hundreds. Lecture halls almost always have a pitched floor, so that those in the rear are elevated higher than those in front of them, giving them visual access to the instructor.
Modern lecture halls often feature audio-visual equipment to aid instruction of the large population. A microphone and loudspeakers are common to help the instructor be heard, and projection screens may be used for large displays.
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