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concave (adj) (especially of lenses and mirrors) curved inward; hollow.

Anything concave has a surface curved inward forming a dip. A concave lens or a concave mirror is curved inwards, so has a hollow space. Any such feature, for example, a hillside curving inwards can be called concave. The space under a promontory, if curved inwards is concave. It offers shelter from sun and rain.

  • Automobiles, trucks, etc., are fitted with concave mirrors to give the driver a rear view of the traffic following the vehicle. As objects in a concave mirror appear smaller than they are, the drivers can get a very good view of even a large number of vehicles following their vehicles.
  • The architecture of John Mason is characterized by concave formation of the outer walls of the foyer of theatre or a hall.
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Last Modified : 11-May 2009
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