A student investigates reflections in a plane mirror. A ray-trace sheet is shown in Fig. 3.1. Fig. 3.1 The student places the reflecting face of the mirror vertically on the line MR. He places two pins, $$\(\mathrm{P}_{1}\)$$ and $$\(\mathrm{P}_{2}\)$$, on line $$\(\mathbf{A B}\)$$. Mark the positions of $$\(P_{1}\)$$ and $$\(P_{2}\)$$ with crosses $$\((X)\)$$ on line $$\(A B\)$$ at a suitable distance apart for this type of ray-trace experiment. Label the positions of $$\(\mathrm{P}_{1}\)$$ and $$\(\mathrm{P}_{2}\)$$.

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