The answer is both convex and converging
It looks like a magnifying glass or reading glasses. It is thicker in the middle than around the edges.
An anaclastic glass is a glass or phial shaped like an inverted funnel with a thin convex bottom which can be made concave or convex by sucking out or blowing in air.
Plano Convex
A magnifying glass.
A magnifying Glass
Convex lenses.
convex
Yes. The lense of a magnifying glass is a convex lense. Convex lenses bulge outwards from the center of the lense on both sides.
The inventor of the reading stone is believed to be Salvino D'Armate, an Italian inventor who is credited with creating the first wearable eyeglasses in 1284. The reading stone, also known as a reading lens, was a convex glass lens that helped magnify text for easier reading.
a convex lense
A magnifying glass is convex, meaning that the lens curves outward.