optical absorption meaning, optical absorption definition | English Cobuild dictionary

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Optical devices, processes, and effects involve or relate to vision, light, or images.      adj   usu ADJ n  
...optical telescopes., ...the optical effects of volcanic dust in the stratosphere.     

optical fibre        ( optical fibres    plural  )
in AM, use optical fiber      An optical fibre is a very thin thread of glass inside a protective coating. Optical fibres are used to carry information in the form of light.      n-var  
optical illusion        ( optical illusions    plural  ) An optical illusion is something that tricks your eyes so that what you think you see is different from what is really there.      n-count  
Sloping walls on the bulk of the building create an optical illusion.     
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