Convex is an adjective that describes something has a surface or boundary that curves or bulges outward. Convex lens are thicker at the center, they do cause light to converge.
A convex polygon.I suspect that what you mean is a convex polygon.
If you mean convex, convex is a term meaning curving out or bulging outwards. It is the opposite/antonym of concave.
The word "lens" comes from the Latin word "lentil," which is a legume that has a similar shape to a double-convex lens. This resemblance led to the term "lens" being used to describe the optic device.
The scientific name for a magnifying glass is a "convex lens." It typically consists of a simple lens that is thicker in the center than at the edges, which allows it to converge light rays and magnify objects. While "magnifying glass" is the common term, the underlying principle involves optics and lens design.
A hand lens is nothing more than a hand-held magnifying glass. The term "hand lens" is used primarily in a laboratory setting. The lens, or glass, is set into a frame with a handle attached. The fictional Sherlock Holmes popularized the hand lens, or magnifyng glass when looking for clues to solve a mystery.
It probably refers to an SLR style camera which can be purchased without a Lens as the lens are interchangeable.
A hand lens is a magnifying glass, archaic term. It makes things like bugs look bigger. You carry it in your hand.
This is a fascinating term - meronym is a term midway between two opposites - for example: black, GRAY, white; another example: convex, FLAT, concave.
The term for an eye in which the natural lens has been replaced with an intraocular lens is "pseudophakic eye."
The medical term for without a lens is aphakia. This condition occurs when the natural lens of the eye is either absent or surgically removed.
ConvexA convex polygon.
Fisheye Lens