Light travels in a straight line. When drawing a light ray: Use a ruler and a sharp pencil to draw a straight line. Add an arrow to show the direction the light is travelling. A ray diagram shows ...

When it comes to getting from one place to another, the ideal way is a straight line. This is something that everyone knows. Also, we know that nature is constantly trying to become better and more ...

Sometimes, chimney smoke can rise up in a perfect-looking, unbroken, straight line, high into the sky above. When this happens, it looks as if a white rope is dangling into the chimney from the ...