Answer :

Final answer:

Dust particles appear to dance in a beam of light in a darkened cinema due to light scattering.

Explanation:

In a darkened cinema, dust particles appear to dance in a beam of light because of a phenomenon called light scattering. When light passes through the air, it interacts with tiny particles, including dust, causing the light to scatter in various directions. As a result, the dust particles become visible as they reflect and scatter the light, creating the appearance of dancing in the beam of light.

Learn more about Light scattering here:

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