In an experiment to determine the focal lengt | vedclass

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(B) In the parallax method,if the eye is shifted to the left and the image appears to shift to the right relative to the object pin,it implies that th

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$f < x < 2f$

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(B) In the parallax method,if the eye is shifted to the left and the image appears to shift to the right relative to the object pin,it implies that the image is further away from the eye than the object pin.Let the position of the object pin be $O$ and the position of the image be $I$. If the image $I$ is further from the eye than the object $O$,then the image $I$ is behind the object $O$ (further from the pole $	ext{P}$).For a concave mirror,an inverted image is formed behind the object when the object is placed between the focus $f$ and the center of curvature $2f$. In this region,the image is formed beyond $2f$.Therefore,the condition for the object distance $x$ is $f < x < 2f$.

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