Physics
Grade-10
Easy
Question
The distance between the focus and the optical center is called the ____.
- Optical distance
- Focal point
- Focal length
- Radius of curvature
Hint:
The focal length of an optical system is the distance measure between focus and optical center.
The correct answer is: Focal length
The distance between the focus and the optical center is the focal length.
- The principal focus is the point where the parallel reflected or refracted rays meet.
- The optical center is the central point of the lens.
- Thus, the distance between the optical centerand the principal focus represents the focal length.
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