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Q: What is the distance between the focal point or focus point in the lens and the vision center or optical center?
  • A. radius of curvature
  • B. principal line
  • C. focal length
  • D. focus
Correct Answer: Option C - Focal length (f)– It is the distance between the principal focus and the optical centre of the lens.
C. Focal length (f)– It is the distance between the principal focus and the optical centre of the lens.

Explanations:

Focal length (f)– It is the distance between the principal focus and the optical centre of the lens.