In an experiment to determine the focal length of a concave mirror by the $ u-v$ method, a student places the object pin $ A$ on the principal axis at a distance of $ x$ from the pole $ P$. The student looks at the pin and its inverted image from a distance keeping his/her eye in line with $ PA$. When the student shifts his/her eye towards the left, the image appears to the right of the object pin.
Mirror
Focal length of a concave mirror
Hence, option B is the correct answer.