This MIGHT be the last thing i need help on. Can u pls help

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?

How do i solve uniform motion problems?

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