Question

What construction can be used to identify a line of reflection?

Answer 1

Perpendicular bisectors are the construction that can be used to identify a line of reflection. Both the original image and the reflected image will be equidistant from the line of reflection. A perpendicular bisector will create right angles with both images and have equal distance. 

Answer 2

Draw a line of symmetry,

Line of symmetry devides the figure into two equal parts &

That line of symmetry is known as line of reflection.