concave mirror

con·cave mir·ror

a spheric reflecting surface that constitutes a segment of the interior of a sphere.
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
An auto keratometer principle is based on refraction; for example, the eye cornea anterior surface acts as a concave mirror and reflects the incoming light.
The Accord 2.0T Sport features a head-up display, which utilizes a concave mirror located behind the instrument panel to project a broad range of information on the lower portion of the windshield directly in front of the driver.
'There is always a pangontra or antidote.' This can be in the form of old coins or a bagua (a convex or concave mirror, available in most Chinese souvenir shops, believed to reflect back negative feng shui energy).
[T]he concave mirror is the corrector (of chromatic aberration) and the lens is the objective."
Then the high priestess raised her arms to invoke Apollo, the Sun God before kneeling in front of a concave mirror. And just as her predecessors had done over 2,000 years ago, she lit a torch from the sun's rays.
In a long pleated robe she then knelt solemnly to the ground and lit the torch within a few seconds using a concave mirror to catch the sun's rays.
A 'real image' of a lamp inside the box was being produced by a concave mirror.
It seems that India is looking at itself in a concave mirror and what it sees is too big.
Astronomical telescopes come in three basic types: refractors, which have a large lens up front to gather and focus the light; reflectors, which have a concave mirror at the bottom of the tube to do the same job, and compound (or "catadioptric") scopes that combine lenses and mirrors for a more compact design.
It follows a fire in Linthwaite, when the concentration of the sun's rays by a magnifying concave mirror set a box of Christmas decorations alight.