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Reflection of Light from a Concave Mirror.

When light is a reflected from a curved mirror
the light rays change direction
in the same way that they do when they pass through a lens.

A convex mirror disperses light like a concave lens
and a concave mirror focuses light like a convex lens.

A concave mirror is used in a reflecting telescope.

Focus of Light Rays by a Concave Mirror

Parallel rays of light (or other electromagnetic rays) are
brought to a focus by the concave mirror to form a real image.

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