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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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2461 Upvotes
Verified Answer
The correct answer is:
$f < x < 2 f$
$f < x < 2 f$
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
$$
f < x < 2 f \text {. }
$$
$\therefore$ Correct option is (b).
$$
f < x < 2 f \text {. }
$$
$\therefore$ Correct option is (b).
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