yes concave is like a cave
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From the point of view of the viewer, it is concave.
Your question needs more information. Convex means a surface curves out, while concave means the surface curves in.
A concave mirror bulges away from the incident light. The image of an object depends on where exactly the object is placed - relative the to focal length of the mirror. See the attached link for more details.
A concave octagon has is an 8-sdided figure in which one or more vertices (interior angles) are more than 180° , producing a shape with an inward bow, or a concavity (think of a cave).
No