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Questions for Discussion: Light Particles Acting Like Waves: The Uncertainty Principle

How does Heisenberg's Uncertainty Principle explain why the image cast by the beam of light gets wider at the point where the slit gets extremely small?

What is the role of prediction in the experiment shown in this video segment?

If the person taking the measurements had stopped just before the slit narrowed enough so that the beam became wider, how would this change your understanding of the behavior of light?