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The expressions relate to the shape of the surfaces of the lens. Concave means that the surface is like the inside of a sphere, convex means that it looks like the outside surface of a sphere. A lens has two surfaces. Most often the spectacle lens are bent away from the eye: the nearer surface is concave and the outside surface is convex.

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How are convex lenses and concave lenses the same?

They are not the same. Convex lens bulge outward, and concave lenses go in ward. Convex lenses focus light, and concave lenses spread light out.


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Concave lenses are thicker at the edges then at the middle. A Convex lens is a lens that is thicker in the center than at its edges.


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Concave lenses curve inwardly.Convex lenses curve outwardly.* See related links.


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Similarity between convex lens and concave lens?

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