Question

Two pins A and B are stuck in front of a mirror, as shown in Fig. In what positions will an observer see the pins for different positions of his eye? Where should he place his eye so that the images of the pins are superimposed?

Answer 1

If the observer looks along a line passing through images A' and B' of the pins in the mirror (Fig.), he will see these images superimposed on each other. In position C, the observer will see the image of pin B to the right of the image of pin A. In position D, he sees the image of pin B lying to the left of the image of pin A.