In an experiment to determine the focal length f of a concave mirror by the u - v method, a student places the object pin A on the principal axis at a distance 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 left, the image appears to the right of the object pin. Then
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f < x < 2f
Since object and image move in opposite directions, the positioning should be as shown in the figure. Object lies between focus and centre of curvature f < x < 2f.
Correct option is
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