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Concave lens
A convex lens.
Convex lenses are thicker in the middle than at the edges. They refract toward the center. Only people have convex lenses. Concave lenses are used in telescopes and glasses. Concave lenses are thinner in the middle than at the edges. When light passes through concave lenses always bend away from each other toward the edges of the lens.A convex or "positive" lens is thicker in the middle and thinner at the edges. A concave, or "negative" lens is thinner at the middle and thicker at the edges. Convex lenses project a real image behind the lens; concave lenses project a virtual image in front of the lens.
convex
The edges of a convex lens are thicker than the middle.
thicker, thinner
Concave lens
A lens that is thinner in the middle and thicker at the edges is called a concave lens.
Concave lens
They can be either. They will converge if thicker in the middle than edges, and diverge if thinner in the middle than edges.
A convex lens.