Dell 1200MP Owner's Manual page 60

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VGA—Video Graphics Array — 640 x 480 pixels count.
XGA—Extra Video Graphics Array — 1024 x 768 pixels count.
Zoom Lens—Lens with a variable focal length that allows operator to move the
view in or out making the image smaller or larger.
Zoom Lens Ratio—Is the ratio between the smallest and largest image a lens can
projector from a fixed distance. For example, a 1.4:1 zoom lens ratio means that a
10-foot image without zoom would be a 14-foot image with full zoom.
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Glossary