For object at 60 cm from convex lens of f = 20 cm, image is:
AVirtual
BSame size
CAt infinity
DReal, inverted, at v = 30 cm, m = -1/2
Answer & Solution
Correct answer: D. Real, inverted, at v = 30 cm, m = -1/2
1/v - 1/u = 1/f. u = -60, f = 20: 1/v = 1/20 + 1/(-60) = (3-1)/60 = 1/30 → v = 30 cm. m = v/u = 30/-60 = -1/2 (real, inverted, half size).
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