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Q: An object is placed in front of a concave mirror at a distance equal to its focal length. The image is formed at:
  • A. a point between F and C
  • B. A point between P and F
  • C. C
  • D. infinity
Correct Answer: Option D - When an object is placed at a distance at the Principal focus of a concave mirror, the image is formed at infinity.
D. When an object is placed at a distance at the Principal focus of a concave mirror, the image is formed at infinity.

Explanations:

When an object is placed at a distance at the Principal focus of a concave mirror, the image is formed at infinity.