Question

what is optical density....​

Answer 1

Absorbance

In optics, absorbance or decadic absorbance is the common logarithm of the ratio of incident to transmitted radiant power through a material, and spectral absorbance or spectral decadic absorbance is the common logarithm of the ratio of incident to transmitted spectral radiant power through a material.

Answer 2

Answer:

$\huge\rm\red{Answer:-}$

The physical quantity which is an indicator of the speed of light through a given medium is called Optical Density.