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    Physics
    Grade-10
    Easy

    Question

    The distance between the focus and the optical center is called the ____.

    1. Optical distance
    2. Focal point
    3. Focal length
    4. 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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