What is Optical density and physical density?

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Solution

The physical density of a material refers to mass/volume ratio. The optical density of a material refers to the sluggish tendency of the atoms of a material to maintain the absorbed energy of an electromagnetic wave in the form of vibrating electrons before reemitting as a new electromagnetic disturbance.

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Similar questions

Is refractive index and optical density the same?

When light is incident obliquely, from a medium of higher optical density to that of lower optical density,

Optical density of a medium is directly proportional to its mass density.

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