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In an experiment to determine the focal ...

In an experiment to determine the focal length (f) fo a concave mirror by the u-v method, a student placed 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 keepin his`//`her eye in line with PA. When the student shifts his`//`her eyes towards left, the image appears to the right of the object pin. Then,

A

`x lt f`

B

`f lt x lt 2f`

C

`x = 2f`

D

`x gt 2f`

Text Solution

Verified by Experts

The correct Answer is:
B
Since object and image move in opposite direction the positioning should be as shown in the figure. Object lies between focus and centre of curvature `f lt x lt 2f`
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