A convex lens has a focal length of 15 cm. At what distance should an object be placed in front of the lens to get a real image of the same size of the object?
- A. 15 cm
- B. 10 cm
- C. 30 cm ✓
- D. 40 cm
Correct Answer: C. 30 cm
Explanation
To obtain a real, inverted image of the same size as the object with a convex lens, the object must be placed at 2f. Here, f = 15 cm, so 2f = 30 cm.
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