The Helix?
The helix, or hilus
Concave
One of the differences between a bay and a gulf is that a bay has an inward land curve. The Hudson Bay has an inward curve.
zig
Yes.
A converging lens, also known as a convex lens, bends light inward towards a focal point. This type of lens is thicker in the middle than at the edges and is commonly used in magnifying glasses and camera lenses.
It is called a concave mirror. Concave mirrors curve inward and have reflective surfaces that cave inwards. They can be used to focus light to create real or virtual images.
A lenses that curve outward is convex.A lenses that curve inward is concave.
Could mean you have Rickets
Both sides of a lens curve inward.
The curve moves inward
The curve moves inward