Question

what is optical density?​

Answer 1

• Physical density refers to the mass-to-volume ratio, whereas optical density refers to the speed of light as it passes through an optically dense material.

• The optical density of a transparent substance is a parameter that determines the speed with which light passes through it.
• The optical density of any optically dense material is the degree to which transmitted light rays bend towards or away from the normal.

• When light flows through an optically dense media, it bends towards the normal, but when it goes through a rarer medium, such as air, it bends away from it.

Answer 2

Answer:

In spectroscopy, optical density is the measure of absorbance, and is defined as the ratio of the intensity of light falling upon a material and the intensity transmitted. Abbreviation OD.