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  3. Physics
  4. With a concave mirror an object is placed at a distance x1 from the principle focus on the principal axis. The image is formed at a distance x2 from the principal focus. The focal length of the mirror is :-

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Q. With a concave mirror an object is placed at a distance $x_{1}$ from the principle focus on the principal axis. The image is formed at a distance $x_{2}$ from the principal focus. The focal length of the mirror is :-

NTA AbhyasNTA Abhyas 2020

Solution:

By Newton's formula, $x_{1}x_{2}=f^{2}$