A reflection does not have any surface.
A reflection does not have any surface.
A reflection does not have any surface.
A reflection does not have any surface.
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Because a reflection reverses the direction of the component of the wave vector of the light hitting the reflecting surface which is orthogonal to the surface. The component parallel to the surface will not change. This means the light going towards a mirror, will go away from the mirror after reflection. But if it went from the left to the right, it will continue to go from the left to the right. Same with up and down. In three dimensions this is the same as changing the handedness of the image.
A line which is the reflection of the original in y = x.
It depends on the kind of transformation: it could be reflection or translation.
A reflection.
The reflection in a line will be another congruent circle.