2. Locate P₁ and P₂. Draw in the rays which are used to sight each of these images. Use one color for both rays for P₁ and a second color for the rays for P₂. Finally, locate P₁₂ and P₂₁.

3. Locate P₂ and P₂₁. Then ONLY draw in the rays which are used to sight P₂₁. Use one color for the ray that enters the top of the eye, a second color for the one that enters the bottom of the eye.