Concave mirror: object at the center of curvature
An object is placed at the center of curvature (2f) of a concave mirror. What image forms?
Answer B: explanation for every choice
A
A virtual, upright, magnified image forms when the object is inside f.
B
Correct. With o = 2f, the mirror equation gives i = 2f and m = −1.
C
A reduced image between f and 2f forms when the object is beyond 2f.
D
Parallel reflected rays, and no image, occur when the object is at f.
TakeawayConcave mirror or converging lens: object at 2f → same-size inverted image at 2f.
Equation usedThin lens and mirror equation
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