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In optics, a thin lens is a lens with a thickness (distance along the optical axis between the two surfaces of the lens) that is negligible compared to the focal length of the lens. Lenses whose thickness is not negligible are sometimes called thick lenses.
Convex ~
The lens of the eye is biconvex (convex on both sides).
a convex lens
convex lens
In optics, a thin lens is a lens with a thickness (distance along the optical axis between the two surfaces of the lens) that is negligible compared to the focal length of the lens. Lenses whose thickness is not negligible are sometimes called thick lenses.
a polygon is convex
A non convex is a concave and a convex is differently shaped
Compared to a uniform thickness lense, concave is where the lense is thinner towards the center of the focal point of the lense than at the thicker edge; convex is much like a magnifying glass where the lense is thicker near the center focal point than at the thinner edges.
projector have concave or convex
the union of two convex sets need not be a convex set.
convex
Convex ~
The lens of the eye is biconvex (convex on both sides).
a convex lens
A convex polygon.I suspect that what you mean is a convex polygon.
A magnifying glass is a convex lens. A convex lens is a type of spherical lens. That means that the magnifying glass consists of two sides of glass and that it is thicker in the middle than the outer edges. The thickness is because the glass bows outward in the middle. The shape of the glass distorts the way we see the image on the other side.