1. Locate the images: P₁, P₂, P₁₂, P₂₁, P₁₂₁ and P₂₁₂. Label all images of P₁ in one color and all images of P₂ in a second color.

 

 

 

 

 

 

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.