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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 eye in the line with PA.When the student shifts his eye towards left, the image appears to the right of the object pin. Then f2f

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 eye in the line with PA.When the student shifts his eye towards left, the image appears to the right of the object pin. Then f2f

Grade:12th pass

1 Answers

Arun
25763 Points
3 years ago
This question is a simple one and is intended to check your understanding of techniques used in experimental physics in addition to your theoretical knowledge. Since the image appears to the right of the object when the student shifts his eye towards the left, the image is nearer to the student and hence the image distance ‘v’ is greater than the object distance ‘u’. This is possible only if the object is placed between f and 2f. So the correct answer is
f
[The image is real since it is inverted as mentioned in the question. The problem can be worked out even if this fact is not mentioned in this problem].

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