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1. Attach the wooden block to the center of the nonreflective side of the mirror using double-sided tape such that the mirror will stand vertical and upright when placed on the horizontal poster board.

2. Place a sheet of legal-size paper in the center of the styrofoam poster board. Draw a line width-wise across the center of the paper. Set the block and mirror assembly such that the back (nonreflective) edge of the mirror rests along this line. Be mindful to keep the mirror in this orientation throughout the duration of the exercise (see pictures a and b below).

3. Assemble the three pins in the field of the mirror's view by pushing them through the paper and into the styrofoam board such that they are approximately 5 cm distant from one another. Draw three lines connecting the positions of the pins on the paper such that the resulting figure is a triangle. The pins, therefore, should occupy the vertices of the triangle. The images of the pins should be clearly visible in the mirror.

4. Using a metric ruler (or the Ray-Sight Method), locate the paths of three rays of light which are directed from each pin to the mirror and in turn reflected by the mirror to one of your eyes as you view the images from differing positions in the field of view.