A ray in geometry is a line with a single endpoint and extends indefinitely in one specified direction.
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incident ray-the light ray striking a reflecting surface is called the incident ray. reflected ray-the light ray obtained after reflection from the surface, in the same medium in which the incident ray is travelling , is called the reflected ray.
The ray comes out parallel to the incident ray because the ray has the opposite refraction as when it entered the block.
Yes, we call ray CV as ray VC. Because meaning of both these are same.
A line extends infinitely in both directions, a ray in only one. A ray can be shown by drawing a small arrow above the name of the ray, with the arrow pointing in the direction of the ray.
Here is an example of a ray:------------->