It just does not bend, its common sense
Edit: light does bend, but it is so fast, it doesn't look like it's bending. If you shoot a laser into the water, you can see that it bends as it touches the surface. Also, you can see that from the night sky. Stars' gravity can bend lights, sometimes stars appears to be bigger, or smaller than it really is.
But remember Newton's Laws. A body set in motion will continue ...
light travels in straight paths called rays
Light travels in a straight line, moving in a straight path known as a ray.
A line.
Normally light travels in a straight line. However, it has been demonstrated that gravity can bend the path of light.
One way to demonstrate that light travels in a straight path is by using a laser pointer. When you point the laser at a wall, the light beam will create a straight line from the laser to the wall. This shows that light travels in straight lines unless it encounters an obstacle or is refracted by a medium.
light takes a straight path.
light travels in a straight path
A line is a straight path that goes on forever in both directions. A ray is a straight path that goes on in one direction.
light travels in straight paths called rays
Yes. But the path of light across the water/air boundary is not.
It is a straight line.
Light travels in a straight line, moving in a straight path known as a ray.
A line.
A ray is a straight path of points that goes on forever in only one direction. A line would go on forever in two directions.
If you mean a straight path, rather than a strait path, then it is a ray.
From rectilinear propagation of light.
An idealised line.