In an experiment to determine the focal length of a concave mirror by the - method, a student places the object pin A on the principal axis at a distance 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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IIT-JEE 2007 · Paper 1, Physics question 2
Answer and worked solution
Official answer: B
Parallax. When the eye moves sideways, the nearer of two objects appears to move in the opposite direction relative to the farther one. The eye moves left and the image appears to the right of the pin, so the image is nearer the eye than the pin, i.e. farther from the mirror: .
For a concave mirror a real inverted image farther from the mirror than the object needs the object between F and C: (the image is then beyond ).
(B)