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Q: An object is placed in front of concave lens at a distance d. An erect image of the object is formed at d/3. If the focal length of the lens is 15 cm, then d is equal to:
  • A. 25 cm
  • B. 20 cm
  • C. 15 cm
  • D. 30 cm
Correct Answer: Option D -
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Explanations:

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