Physicshard · Past Paper
An object is placed at a distance of 12 cm from a concave mirror of focal length 15 cm. The image is:
AReal and 60 cm away
BVirtual and 60 cm away
CReal and 30 cm away
DVirtual and 30 cm away
✓ Correct Answer: B — Virtual and 60 cm away
1/v = 1/f - 1/u = 1/-15 - 1/-12 (using sign convention) => 1/v = -1/15 + 1/12 = 1/60. v = +60 cm (virtual).
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