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Why is light or a laser beam more visible at night than during the day?
When you flash a flashlight during night you can see some of the dispersing light between the flashlight and the wall. However, this light can't be seen during the day. Why is that?
What you're seeing is the reflection of the light off small particles in the air.
But there's not much of this light, because the particles don't scatter much. During the daytime, this small amount of light can't compete with the reflection off big objects that are reflecting a lot of light: your eyes simply won't be able to distinguish this "signal". But at night, there's no sunlight, so your eyes will not be "drowned" by the other stuff. (As a physical aspect of that: the iris of your eyes will be open wider.)
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