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Vocabulary Word

Word: concave

Definition: hollow; curved inwards; OP. convex


Sentences Containing 'concave'

The last three types, called concave lenses, scatter parallel rays so that they do not come to a focus, but diverge widely after passage through the lens.
Nearsightedness can be remedied by wearing concave glasses, since they separate the light and move the focus farther away.
Concave glasses, by separating the rays and making the focus more distant, overbalance a wide eyeball with its tendency to focus objects in front of the retina.
Supposing there is a convex curve on the one side, you will often have a concave form on the other.
Through the larger part of the river works of contraction will not be required, but nearly all the banks on the concave side of the beds must be held against the wear of the stream, and much of the opposite banks defended at critical points.
In ordinary combs it has appeared to me that the bees do not always succeed in working at exactly the same rate from the opposite sides; for I have noticed half-completed rhombs at the base of a just-commenced cell, which were slightly concave on one side, where I suppose that the bees had excavated too quickly, and convex on the opposed side where the bees had worked less quickly.
In the middle of the concave side, there is a groove twelve inches deep, in which the extremities of the axle are lodged, and turned round as there is occasion.

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