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If an object is concave, it means that is contains a surface that curves inward. Eyeglass lenses and bowls, for example, can both be said to be concave.

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What curves in?

Lots of different things curve in. Something that curves inwards can also be called concave, a spoon is an example of something that is concave. A bowl is also concave and curves inward.


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What does bi-concave mean?

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What does 'concave up' mean in physics terms?

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