Converging lens: image of an object beyond 2f
An object is placed 30 cm in front of a converging lens with a focal length of 10 cm. The image is:
Answer A: explanation for every choice
A
Correct. 1/i = 1/f − 1/o = 1/10 − 1/30 = 2/30, so i = +15 cm. Positive i means a real image. m = −i/o = −0.5, so it is inverted and reduced.
B
A converging lens produces a virtual image only when the object is inside the focal length.
C
This comes from adding 1/f and 1/o instead of subtracting.
D
This describes an object placed inside f, as with a magnifying glass. Here the object is at 3f.
TakeawayConverging lens, object beyond 2f: real, inverted, reduced image between f and 2f.
Equation usedThin lens and mirror equation
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