Answer:
[tex]s = \frac{4}{d}[/tex]
Explanation:
The image height ratio in the viewfinder to its lateral length (6 in) is equal to the pin height ratio (8/6 yards) to the pin distance (8/6 yards) in yards. so we can write:
[tex]\frac{s}{3} = \frac{\frac{8}{6}}{d}[/tex]
[tex]s*d = \frac{8}{6}*3[/tex]
s*d = 4
therefore, distance as function of s is express as
[tex]s = \frac{4}{d}[/tex]
