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A straight line with arrow in the end
It is a straight line.
If you mean a straight path, rather than a strait path, then it is a ray.
A line.
a line
Ray
A never-ending straight path that goes in one direction is called a line. Euclid, the Greek mathematician, described it as "breathless length".
a road......?
It is called a line segement
This is the second law of reflection phenomenon. So if a ray falls normally on the reflecting mirror then the angle of incidence will be 0. So as the angle of reflection also is to be 0, the ray just retraces its path. That is it is coming back in the same straight line.
straight
A line is a straight path that extends infinitely or endlessly in opposite directions. A straight path that joins two points is called a line segment.
With a curved path you have to slow down to curve as with a straight path you dont have to slow down you can do as fast as you need to go to get threw it.
straight
light takes a straight path.
Straight line
The symbol for Straight Path Communications Inc. in the AMEX is: STRP.