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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.
The PPF is bowed outwards (concave to the origin) as tradeoffs between the production of any two goods are constant.
Diminishing Marginal returns to capital and labor.
This is a result of a bone disease called osteoporosis.
John 19 v30When Jesus therefore had received the vinegar, he said, It is finished: and he bowed his head, and gave up the ghost. The Gospel of John Ch.19 Verse 30.