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optical density

British  

noun

  1. physics the former name for reflection density transmission density

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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The resonant cavity increases the local optical density of states and helps emitted light escape more efficiently.

From Science Daily • Mar. 24, 2026

The researchers monitored growth through optical density and chlorophyll-a levels to measure how these chemical factors affected cyanobacterial productivity.

From Science Daily • Nov. 2, 2025

Accordingly, when the optical density of the air changes as a result of its varying content of moisture, the colour-phenomenon undergoes an opposite change in each of the two cases.

From Man or Matter by Lehrs, Ernst

This defect in the eye-lens is somewhat counteracted by a variable optical density, increasing from the outer to the central portion.

From Visual Illusions Their Causes, Characteristics and Applications by Luckiesh, Matthew

One other such phenomenon is that of so-called apparent optical depth, which an observer encounters when looking through transparent media of varying optical density.

From Man or Matter by Lehrs, Ernst