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Q: A concave mirror is made from a section of the surface of a sphere of radius 18.0 cm. According to New Cartesian Sign Convention, its principal focus is located at x = _______.
  • A. 9 cm
  • B. – 18 cm
  • C. – 9 cm
  • D. 18 cm
Correct Answer: Option C -
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Explanations:

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