In the parallax method for the determination | vedclass

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(B) In the parallax method, we need to form a real image of the object to observe the parallax between the image and the needle.For a concave mirror,

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at any point beyond the focus $(F)$ of the mirror

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(B) In the parallax method, we need to form a real image of the object to observe the parallax between the image and the needle.For a concave mirror, a real image is formed only when the object is placed beyond the focus $(F)$.If the object is placed between the pole $(P)$ and the focus $(F)$, the image formed is virtual, erect, and magnified, which cannot be used for the parallax method as it cannot be captured on a screen or observed as a real point of coincidence.Therefore, the object must be placed at any point beyond the focus $(F)$.

In the parallax method for the determination of the focal length of a concave mirror, the object should always be placed:

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