Laser beam in oil/water, why is it easier to see beam in oil

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SUMMARY

A laser beam is more visible in oil than in water due to the differences in transparency between the two substances. Oil, being less transparent than water, causes greater scattering of light, which directs more photons toward the observer's eye. The discussion clarifies that while density is a factor in light behavior, the key reason for the visibility difference lies in the scattering effects of the materials rather than their optical density.

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  • Basic knowledge of optical density and transparency
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  • Awareness of optical terminology, specifically dispersion
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  • Investigate the optical properties of oil and water in detail
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Petra de Ruyter
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Hi there

I have a general question. I understand the process of light through a optically denser material, slower speed etc... but why would a laser beam in oil be easier to "see" than a laser beam through water.

Cheers
 
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because oil is less transparent than water so there is more dispersion of photons towards your eye. Density has nothing to do with it, it's all about transparency.
 
If I might suggest - the term dispersion is used correctly to mean the light is dispersed or sent in many directions but it also has another meaning in optics, namely the separation of light into its different colors as with a prism. So to avoid confusion, we could say there is more scattering of light in oil compared to the more transparent water.
 

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