The first line of music shows a glide reflection from all the lines.
What is a glide reflection?
A glide reflection is one of the types of reflection in 2-dimensional geometry.
It is a symmetry figure that consists of a reflection over a line and then translates along the line.
In this figure, the first option shows the exact symmetry operation and reflection. but the second and third line doesn't represent a glide reflection.
In the second option, the reflection does not take place, the music lines are the same before and after.
In the third option, the music lines are just interchanged which doesn't prove the glid reflection.
Learn more about reflection;
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