Both sides of a lens curve inward.
The word concave is derived from the Latin word concavus, from cavus, meaning cave.
Double-convex lens
A converging lens is also known as a magnifying lens. The shape of the lens is a double convex shape.
The eye itself is concave, meaning it is curved inward. The cornea and lens within the eye, however, are convex in shape.
The concave side refers to the side of a curve that is curved inward or "caved in." It is the side that appears to be creating a hollow or depression in the surface. In geometry, concave shapes curve inward, like a cave.
A magnifying glass is convex, meaning that the lens curves outward.
A double convex lens is thicker in the middle and thinner at the edges, causing light rays passing through it to converge. A double concave lens is thinner in the middle and thicker at the edges, causing light rays passing through it to diverge.
In physics, 'concave up' refers to the shape of a curve or surface that opens upward, resembling a cup that faces upwards. This typically signifies a region where the rate of change of a function is increasing. It is often associated with the idea of a positive second derivative.
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meaning of double hump
If you mean convex, convex is a term meaning curving out or bulging outwards. It is the opposite/antonym of concave.
The opposite of convex is concave. Concave shapes have an inward curve, while convex shapes have an outward curve.