Uncertainty principle - light beam

AI Thread Summary
The discussion centers on the behavior of a light beam when projected through a slit, particularly at a distance of 100 meters. It questions whether the beam would still spread out under these conditions and emphasizes that human consciousness does not influence the uncertainty principle. The conversation highlights the importance of the slit edges' imperfections, suggesting that ragged edges can affect the beam's projection. Additionally, it raises the question of why a physicist would not also reduce the height of the slit while decreasing its width. Overall, the dialogue explores the implications of slit geometry on light behavior and distortion.
Dav333
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In regards to watching this video:


If the distance between the light source & board which the light is being displayed on was far apart like 100m. & you were the only person around observing the results right near the display. Then would the beam still be spread out?

Confused with this, thanks.
 
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Human consciousness has nothing to do with the uncertainty principle.
 
What about the fact that the edges of the slit are vertical, and their imperfection (not smooth but ragged) becomes more and more important with respect to the width of the slot?

Why would not this “physicist” decrease the height of the slot too while the width diminishes?

My point is that in the case of a large slot the beam goes through undisturbed (round projection) and projected as a round.

With the unsymmetrical "type" of reduction of the slot (that is in the vertical direction only) horizontal distortion occurs due to the edges of the slot but not to the vertical direction (because no interaction occurs there).
 
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