concave mirror ( synonym found)
Definition of concave mirror:

°curved inward like the inside of a bowl.
°A concave surface or curve.
°An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
°To render concave, or increase the degree of concavity.
Definition of concave mirror:

°curved inward like the inside of a bowl.
°A concave surface or curve.
°An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
°To render concave, or increase the degree of concavity.
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