In the parallax method for the determination of the focal length of a concave mirror, the object should always be placed:
- Abetween the focus $(F)$ and the centre of curvature $(C)$ of the mirror $ONLY$
- Bat any point beyond the focus $(F)$ of the mirror
- Cbeyond the centre of curvature $(C)$ of the mirror $ONLY$
- Dbetween the pole $(P)$ and the focus $(F)$ of the concave mirror $ONLY$
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