Which of the following would be a line of reflection that would map ABCD onto itself?

Square ABCD with B at 1 comma 3, A at 1 comma 1, D at negative 1 comma 1, and C at negative 1 comma 3.

A. x = 1
B. −x + y = 2
C. x − y = 2
6. 2x + y = 3

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters