Physicsmedium · Past Paper
If an object is placed 20 cm from a concave mirror of focal length 10 cm, the image is formed:
AAt 10 cm
BAt 20 cm
CAt infinity
DBetween 10 and 20 cm
✓ Correct Answer: B — At 20 cm
Since u = 20cm and f = 10cm, the object is at C (2f). The image is formed at C.
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