Question

Define optical density
Ans.-The physical quantity which an indicator of the speed of a light through a given medium .​

Answer 1

Answer:

Basically, the physical density would be the ratio of mass to the volume, and optical density measures the speed of light while passing through an optically dense medium. The optical density is a property of a transparent material that measures the speed of the light through the material.

Explanation:

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Answer 2

The ability of a medium to reflect light is also expressed in term of it's optical density..