What is the way of light

The way of light

You can imagine the light as onestraight way in the form of light rays (so-called light ray model). Light rays propagate in from a light source all possible directions out.

There are an unimaginable number of thin beams of light that move away from the light source next to one another and one behind the other at breakneck speed. There are no gaps and that is one reason why light rays cannot actually be seen. Therefore, the path of light from the sun should rather be represented as a large cloak that envelops the sun.

Rays of light become too Bundles of light summarized. I have drawn a bundle of light for the sun at the bottom right. I can limit the light bundle by introducing two light rays at the edge (edge ​​rays).


Light beams usually get wider and bigger on their way.


How does the light spread in a flashlight?

The light tries to spread in all directions from the bulb of a flashlight. However, it does not work. There is only one opening through which rays of light can spread further in the room. Therefore, a bundle of light spreads from the flashlight, the path of which can be clearly shown with the edge rays.

Experiment: With a flashlight you can test wonderfully whether the light bundles really get wider and bigger on their way. Shines a flashlight against the wall in the dark room. You will see a round spot of light on the wall, which is usually larger and wider than the light opening of the flashlight. And now you make the path between the wall and the flashlight smaller and larger. Observe how the light spot changes! The longer the distance between the flashlight and the wall, the larger the light spot.