Question

what is optical density?( for 8 th class)

Answer 1

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Optical Density and the Index of Refraction. Like any wave, the speed of a light wave is dependent upon the properties of the medium. In the case of an electromagnetic wave, the speed of the wave depends upon the optical density of that material. The optical density of a medium is not the same as its physical density.

Answer 2

A degree to which a refractive medium retards transmitted rays of light it is known as optical density