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It depends on the uses the lens are going to be put to. A lens may have a convex front and a flat back, or a convex front and a concave back, or even a convex surface on both front and back. Or even concave on both the front and back.
Concave means bowed inwards.
Convex means bowed outwards.
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Earn +20 ptsQ: How many flat or curved surfaces are on a lens?
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