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-- A concave mirror gathers the light and bunches it up all in one place, called

the "focus" of the mirror. There's a "real image" at that place, and you can

capture it with a piece of ground glass, tissue, photo-film, or light-sensitive device

at that place.

-- A plane mirror doesn't gather anything. It just kind of sends the light back

toward where it came from. It doesn't form any real image, and there's nothing

to capture.

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Q: Why is a concave mirror better for gathering light than a plane mirror on a telescope?
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