Physicsmedium · Past Paper
The focal length of a concave mirror is 10 cm. If an object is at 20 cm, where is the image?
AAt 10 cm
BAt 20 cm
CAt infinity
DBetween 10 and 20 cm
✓ Correct Answer: B — At 20 cm
20 cm is the center of curvature (2f). Objects at C form images at C.
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