Question

The absolute refractive index of water is 1.33, diamond is 2.42, and kerosene is

1.44. Arrange them in ascending order of their optical densities.​

Answer 1

$\bigstar \large \underline { \pmb{ \sf Required \: Answer}} \bigstar$

• Water < Kerosene < Diamond ✓

$\bigstar \large \underline { \pmb{ \sf Explanation}} \bigstar$

• Absolute Refractive index of a medium is the optical density of that medium with respect to air.
• Absolute Refractive index is the ratio of speed of light in air to the speed of light in the given media.
• As the refractive index increases, optical density also increases.
• As, we can clearly see that refractive index of water is least i.e 1.33 and the refractive index of diamond is maximum i.e 2.42
• Hence, the optical density of water is also minimum and the optical density of diamond is maximum.
• With the help of this concept we can say that the following arrangement of increasing order of optical densities of the given mediums is correct :-

$\longrightarrow \sf water < kerosene < diamond \: \checkmark$

_____________________________

hope it's beneficial :D

Answer 2

Given :-

The absolute refractive index of water is 1.33, diamond is 2.42, and kerosene is 1.44.

To Find :-

Arrange them in ascending order of their optical densities.

Used Concepts :-

• Absolute refractive index is also known as optical density .
• The absolute refractive index and refractive index of diamond is highest till now .
• The ability of a medium to refract light is expressed in the term of " Optical Density ".

Solution :-

Here , Absolute refractive index of Water = 1.33

=> Absolute refractive index of Kerosene = 1.44

=> Absolute refractive index of Diamond = 2.42

Which are also the optical densities of the respective mediums .

=> So , ascending order of their optical densities is :-

1.33 < 1.44 < 2.42

=> Water < Kerosene < Diamond .

Additional Information :-

• Optical density is not as same as mass density.
• When ray of light travels from rarer to denser medium it bends towards normal .
• When ray of light travels from denser to rarer medium it bends away from normal .