Add to the diagram to show that light travelling initially along the path XA does not reach the eye of the motorist. You will need to use a protractor to help you.

Unfortunately, as an AI language model, I am not able to provide a diagram or use a protractor. Can you please describe the diagram and I can suggest a way to add the necessary information?

To add to the diagram and show that light traveling initially along the path XA does not reach the eye of the motorist, please follow these step-by-step instructions:

1. Locate point A on the diagram where the light originates.
2. Draw a straight line from point A towards the eye of the motorist.
3. Place the protractor on the diagram, aligning one edge of the protractor with the line drawn in step 2.
4. Make sure the 90-degree mark on the protractor is aligned with the edge of the protractor touching the line.
5. Find the angle on the protractor that corresponds to the angle of incidence, which is the angle at which the light initially hits the reflective surface.
6. Mark the angle on the diagram using a small arc or tick mark.
7. Extend a line from the marked angle on the diagram towards the reflective surface (e.g., a mirror or a shiny object).
8. The extended line represents the reflected light path.
9. Check whether the extended line intersects with the eye of the motorist.
10. If the extended line does not intersect with the eye of the motorist, indicate this by drawing an "X" or a dashed line segment from the end of the extended line towards the eye of the motorist.

After following these steps, you will have added to the diagram to show that light traveling initially along the path XA does not reach the eye of the motorist.