What is meant by optical density,2.what is meant by propagation

1.	What is meant by optical density,2.what is meant by propagation
Answer» A measure of the EXTENT to which a SUBSTANCE transmits light or other electromagnetic radiationis known as optical density.2. The ACT or process of propagating, especially the process by which a DISTURBANCE, such as the motion of electromagnetic or sound waves, is transmitted through a medium such as air or WATER.

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What is meant by optical density,2.what is meant by propagation

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