Because a straight line is the shortest path it can follow between two points.
However a locally straight line may not be a globally straight line. This is how a gravitational field bends the path of light according to General Relativity.
Yes, a shadow is proof that light travels in a straight line because shadows are formed when an object blocks light that is traveling in a straight path from the source to the surface where the shadow is cast. If light did not travel in a straight line, shadows would not form as they do.
Normally light travels in a straight line. However, it has been demonstrated that gravity can bend the path of light.
Place objects in the path of a beam of light in a dark room. If the beam is blocked by the objects, light is not traveling in a straight line. However, if the objects cast distinct shadows with sharp edges, it demonstrates that light does travel in a straight line.
Light travels in a straight line, moving in a straight path known as a ray.
A straight line that represents a light wave is called a ray. It is used to show the direction of light propagation in geometrical optics.
Trajectory
Yes, a shadow is proof that light travels in a straight line because shadows are formed when an object blocks light that is traveling in a straight path from the source to the surface where the shadow is cast. If light did not travel in a straight line, shadows would not form as they do.
No
Straight line.
light passes in straight line
Normally light travels in a straight line. However, it has been demonstrated that gravity can bend the path of light.
no it does not
Place objects in the path of a beam of light in a dark room. If the beam is blocked by the objects, light is not traveling in a straight line. However, if the objects cast distinct shadows with sharp edges, it demonstrates that light does travel in a straight line.
light travels in a straight line because it can only be bend by reflective objects.
Light travels in a straight line, moving in a straight path known as a ray.
A straight line that represents a light wave is called a ray. It is used to show the direction of light propagation in geometrical optics.
rise over run