We only show a few light rays when we draw a ray diagram to; represent the incident ray and reflected rays
When a Light passed through a medium ( mirror ), there is an infinite amount of rays that accompanies the light which can not be explicitly represented in a ray diagram, therefore to represent the light rays a few number of light rays are drawn in order to properly represent the incident and reflected rays on the the ray diagram.
Hence we can conclude that only a few light rays are drawn to represent the incident and reflected rays
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