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Q.

[[1]] is used in solar furnaces.


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Detailed Solution

A concave mirror is used in a solar furnace.
The solar furnace is kept practically at the focal point of the wide concave reflector. The concave reflector guides the sun's heat rays on the furnace and attains the maximum temperature. It's the equivalent of taking a magnifying glass to burn the paper. The difference is that the magnifying glass is a lens instead of a mirror, but both devices collect light and gather it into a single point.
  
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