An object is placed 20 cm in front of a thin converging lens with a focal length of 15 cm. What is the image distance and the nature of the image?
Answer and explanation
Correct answer: B. 60 cm, real and inverted
- Step 1: Apply the thin lens equation: .
- Step 2: Common denominator is 60: . A positive image distance with a converging lens signifies a real, inverted image.
Answer
60 cm, real and inverted.
Why not the others: 30 cm miscalculates the focal equation; 45 cm subtracts distances directly; real images produced by a single lens are inverted, not virtual.
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