Darth Maul's double light saber because the rays from the light saber are going 2 different directions.
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The sun gives off radiation. An x-ray machine gives off radiation.
the light from a flashlight. you know the origin of light but you cannot measure exactly the distance the light travels or the sun's ray of light...same same Or Just an laser beam
Here is an example of a ray:------------->
It is the opposite ray.
The ray comes out parallel to the incident ray because the ray has the opposite refraction as when it entered the block.