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Q: Which of the following statements is true?
  • A. radius of curvature is equal to focal length
  • B. radius of curvature is half of the focal length
  • C. radius of curvature is equal to three times the focal length
  • D. radius of curvature equal to twice the focal length
Correct Answer: Option D - The radius of curvature (R) is equal to twice the focal length (f). R = 2f.
D. The radius of curvature (R) is equal to twice the focal length (f). R = 2f.

Explanations:

The radius of curvature (R) is equal to twice the focal length (f). R = 2f.