What are scattering losses?

In UV spectroscopy, when a beam of light is shone into solution, what is scattering loss during this process? 




Scattering is the redirection of the 'beam' of light, as is illustrated in the diagram below:


![enter image description here](https://i.stack.imgur.com/dC574.gif)


*Source: [University of Wisconsin](http://cimss.ssec.wisc.edu/wxwise/class/optics.html)*


The description from the document [Fundamentals of modern
UV-visible spectroscopy](http://www.chem.agilent.com/library/slidepresentation/public/present.pdf) (Figure 46) states that



> 
> Scattering causes an apparent absorbance because less light
>  reaches the detector
> 
> 
> 


They also detail two main types of scattering in UV spectroscopy (Figure 47):



> 
> • [Rayleigh scattering](https://en.wikipedia.org/?title=Rayleigh_scattering): Particles small relative to wavelength  
> 
>  • [Tyndall scattering](http://chemwiki.ucdavis.edu/Physical_Chemistry/Physical_Properties_of_Matter/Solutions_and_Mixtures/Colloid/Tyndall_Effect): Particles large relative to wavelength
> 
> 
> 


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