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if object is in front of focus
bigger, upright
concave mirror
semi circle opened to the left
convex
semicircle opened to right
centre of curvature - C
center of sphere 2F
Principal axis
Line thru C to midpoint of mirror
Vertex
Where principal axis and mirror meet
focus (F) is the point where light rays are
parallel to principal axis converge WHEB reflected off a concave mirror
An image appears
Where reflected rays intersect