If an object is placed at the focus of a convex lens, its image is
- A. at the focus on the same side.
- B. at the focus on the opposite side.
- C. coincident with the lens.
- D. at infinity. ✓
Correct Answer: D. at infinity.
Explanation
When an object is placed exactly at the principal focus of a convex lens, the refracted rays emerge parallel to each other, forming a real, inverted, and highly enlarged image at infinity.
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