geometry
posted by Anonymous on .
If an object is reflected twice over parallel lines, and corresponding points of the original and final translation image are 26 centimeters apart, how far apart are the parallel lines?

Is this a geometry or optics question?
I do not understand what it means to be "reflected twice over parallel lines"
Please clarify 
If an object is reflected twice over parallel lines, and corresponding points of the original and final translation image are 26 centimeters apart, how far apart are the parallel lines

m<xyz=3x+9
m<xyw=5x+9 
If an object is reflected twice over parallel lines, and corresponding points of the original and final translation image are 26 centimeters apart, how far apart are the parallel lines?