Physicshard · Past Paper
A point object is placed 10 cm from a convex lens of focal length 20 cm. The image formed is:
AReal and 20 cm away
BVirtual and 20 cm away
CVirtual and 10 cm away
DReal and 10 cm away
✓ Correct Answer: B — Virtual and 20 cm away
1/v = 1/20 + 1/(-10) = (1-2)/20 = -1/20. So v = -20 cm (virtual).
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