# Thread: Shadows??

1. i was watching a football match with some friends the other day and we somehow got into a discussion of how the players are casting 4 shadows. i dont think we managed to find the accurate answer so i thought i would put this up for discussion as i am quite baffled at how it is possible. any thoughts or facts?

2.

3. There are lights coming from all different sides of the stadium, hitting the players from different angles, and hence creating shadows with different paths.

If you are in a room, and there is a light in the right corner and left corner in front of you, and also the right and left corner behind you, you too will create four shadows on the floor. The shadows become more elongated the higher up the light source.

4. i always thought that if there was light in front of you and behind you that you wouldnt cast a shadow. or does that depend on the strength of the lightsource?

5. Intensity of the light source is an important variable, yes. You'll still cast a shadow, but if there are lights on both sides, it will just make the shadow less distinct... less defined... more diffuse.

6. Look at any footnall stadium and typically it will be lit by four sets of powerful lights placed beyond the corners of the pitch.

7. Originally Posted by donuts
i always thought that if there was light in front of you and behind you that you wouldnt cast a shadow. or does that depend on the strength of the lightsource?
"Shadow" is a relative term. Imagine you are lit from four sides, East, North, West, and South. If you look at a patch of ground some distance away from you, it is lit by all four lights which add together in determining how well lit the ground is. If you look at the ground right next to you and just East of you, it is lit by only three lights, as you are blocking the light from the the light to the West of you. Three lights illuminate the ground less than 4, so that patch of ground will be lit more dimly, and you get a shadow, which is just a less well lit spot. The same holds for the other three directions.

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