If we carefully recreate these clues by drawing shading patterns, even on a flat piece of paper, our brain reflexively creates the 3D concave or convex shape.

Here's the flat-front lens, we have a concave lens and a convex lens.

Most mammal eyes have a structure called a lens– a transparent, convex structure whose shape refracts light to enable sight.

One day he took us out into the sun and tried to show us how to find the focal length of a convex lens.

So I learned the lesson of convex lens leadership from that.

In a 2001 paper, the economists Geeta Gandhi Kingdon and Jeemol Unni found that India’s education-wage relationship is convex, meaning that economic returns from secondary education are higher than they are from primary education.

The prominent green pupils of his eyes were convex as those of a cat's; the unwinking contours of his eyelids proclaimed the impossibility of any human feeling; his thin lips were stretched and curved over his protruding teeth.

Then with an expression of interest he laid down his cigarette, and carrying the cane to the window, he looked over it again with a convex lens.

Convex in sentence

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