The distance between the optical centre of a convex lens and its principal focus is called its_______?
Correct answer: A. Focal Length
- A. Focal Length
- B. Radius of Curvature
- C. Power
- D. Magnification
Explanation
The focal length is the distance from the optical centre of a lens to its principal focus. Radius of curvature refers to the curvature of a lens surface, not this centre-to-focus distance.
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