Final answer:
To determine the horizontal and vertical length of your head in terms of eye lengths, you can perform an experiment. Draw two lines on a white sheet of paper, move away from the paper until you can no longer distinguish the lines, and measure the distance. Repeat this process for the vertical length. The measurements will give you the desired lengths in terms of eye lengths.
Step-by-step explanation:
The horizontal length of your head can be measured in terms of eye lengths. To find this, you can perform an experiment to determine the resolution of your eye.
Draw two lines on a white sheet of paper, several millimeters apart. Move away from the paper until you can no longer distinguish the two lines.
Measure the distance between your eyes and the paper. This distance, in millimeters, is the horizontal length of your head in terms of eye lengths.
The vertical length of your head can also be measured in terms of eye lengths. To find this, you can perform a similar experiment as for the horizontal length.
Draw two lines on a white sheet of paper, several millimeters apart. This time, move the paper vertically and determine the maximum distance at which you can still distinguish the two lines. Measure this distance and convert it to eye lengths.