A convex shape is the opposite of a concave shape. It curves outward, and its middle is thicker than its edges. Finding a mnemonic device for concave is easy enough. The main parts of the complex are connected by spaces in which dark alternates with light, concave elements with convex and closing-in with opening-up, and the pursuit of extraordinariness is occasionally paused by something quieter.
The Guardian. Get close and you can see your fuzzy reflection in the inner curve of its concave silver surface, as the gold textile billows outward, muted and diaphanous, from the shiny pristine edge of the metal. Willamette Week. Malta Today. A VR headset is little more than a pair of convex lenses with a display or two hidden behind.
New Atlas. What do these words even mean? What does concave mean? Concave is an adjective that describes a surface that curves inward, or is thinner in the middle than on the edges. In ordinary usage, concave and convex are typically used when referring to glass surfaces, like the lenses of optical viewing equipment.
Concave also has a usage in mathematics, where it refers to the negative of a specific type of function. You should consult a math tutor for a more mathematically precise definition of the function itself. To describe such a function in words, however, you might write a sentence like this:. What does convex mean? Meanwhile, convex describes a surface that curves outward, or is thicker in the middle than on the edges.
You can easily find examples of these surfaces in everyday life. The outside surface of an eyeglass lens is convex. Convex means curving outward—like the shape of the outside of a contact lens. To put it another way, a concave shape can be filled, while a convex shape creates a dome. A crater is roughly concave. A mound is roughly convex. How do you measure that outward curve though?
Learn the ins and outs of the ratio pi to find out. Concave lenses—those that are thicker around the edges than they are in the center— disperse light rays, which can have the effect of making things look smaller or farther away. Convex lenses—those that dome outward and are thicker in the center than they are around the edges—make light rays converge. Convex lenses have the opposite effect of concave ones: they can make things look closer or bigger. There are mainly two types of lens. Magnifying glasses and some binoculars use convex lenses.
Concave lenses are used in movie projectors to spread out the image onto the screen if you look back through the lens, inside the projector, the image will look tiny. Some optical devices, like telephoto lenses for cameras, use a combination of concave and convex lenses. Concave lenses are used in eyeglasses for people who are nearsighted those who have trouble seeing things that are far away. This may seem counterintuitive, but it all has to do with how the lenses help the image get processed by the eye.
Convex lenses sometimes have the effect of inverting far-away images. Many binoculars that use convex lenses solve this issue through the use of prisms that turn the image right-side up. A similar thing happens with your eyes. Because the eyeball is curved, the images that pass through it are inverted, and the brain has to flip them so you can see them the right way.
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