What is the difference between Optical Density and Mass Density? Give examples.
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Optical density is related to light speed . The medium in which speed of light is more is considered as rarer medium. The medium in which speed of light is less is considered as denser medium.
Example:Let us consider a pair of media : Air and water
Light travels with greater speed in air and with less speed in water. Hence air is called as rarer medium and water as denser media.
mass density is related to heaviness or lightness of an object.
Mass density=Mass of object/ Volume of object
example: let us consider two objects iron and cotton with 1kg. We know that cotton occupies more space than iron hence density of cotton is less than iron.
So iron is more heavier than cotton.
Example:Let us consider a pair of media : Air and water
Light travels with greater speed in air and with less speed in water. Hence air is called as rarer medium and water as denser media.
mass density is related to heaviness or lightness of an object.
Mass density=Mass of object/ Volume of object
example: let us consider two objects iron and cotton with 1kg. We know that cotton occupies more space than iron hence density of cotton is less than iron.
So iron is more heavier than cotton.
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26
Answer:
Optical density should not be confused with mass density, which is mass per unit volume. It is possible that mass density of an optically denser medium may be less than that of an optically rarer medium (optical density is the ratio of the speed of light in two media).
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