The figure below shows the cross-section of a rectangular mirror with dimensions a and b. A light ray reflects between the mirrors such that its trajectory traces out a single rectangle with dimensions c and d. What is the ratio a/b?
[Figure: Rectangular cross-section with dimensions a and b, showing light ray path forming rectangle with dimensions c and d]
A. c/d
B. √(c²d²)/(c²+d²)
C. 1
D. c/(-d)
E. (-d)/c