The refractive indices of media $A$ , $B$ and $C$ are $2.25$ , $1.25$ and $1.50$ . Find the medium having a. highest optical density.

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Solution

The refractive index of a medium is defined as the ratio of the speed of light in the air to the speed of light in that medium.
The medium with a higher refractive index is termed an optically denser medium.
The higher the refractive index, the higher the optical density of the medium.
Among the given media, medium A has the highest refractive index.
Thus, medium A has the highest optical density.

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Q. Total internal reflection can take place only if
(a) light goes from optically rarer medium (smaller refractive index) to optically denser medium
(b) light goes from optically denser medium to rarer medium
(c) the refractive indices of the two media are close to each other
(d) the refractive indices of the two media are widely different.

Find out, from Table, the medium having highest optical density. Also find the medium with lowest optical density.

Material medium	Refractive index	Material medium	Refractive index
Air	1.0003	Canada Balsam	1.53
Ice	1.31	-	-
Water	1.33	Rock salt	1.54
Alcohol	1.36	-	-
Kerosene	1.44	Carbon disulphide	1.63
Fused quartz	1.46	Dense flint glass	1.65
Turpentine oil	1.47	Ruby	1.71
Benzene	1.50	Sapphire	1.77
Crown glass	1.52	Diamond	2.42

The refractive indices of four media A, B, C and D are 1.44, 1.52, 1.65 and 1.36 respectively. When light travelling in air is incident in these media at equal angles, the angle of refraction will be the minimum : (a) in medium A (b) in medium B (c) in medium C (d) in medium D

Question 3
Find out, from the table, the medium having highest optical density. Also, find the medium with lowest optical density.

$Material mediumRefractive indexMaterial mediumRefractive indexAir1.0003Canada Balsam1.53Ice1.31−−Water1.33Rock salt1.54Alcohol1.36−−Kerosene1.44Carbon disulphide1.63Fused quartz1.46Dense flint glass1.65Turpentine oil1.47Ruby1.71Benzene1.50Sapphire1.77Crown glass1.52Diamond2.42$

The refractive indices of media $A$ , $B$ and $C$ are $2.25$ , $1.25$ and $1.50$ . Find the medium having b. lowest optical density.

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The refractive indices of media A, B and C are 2.25, 1.25 and 1.50. Find the medium having a. highest optical density.

The refractive indices of media $A$ , $B$ and $C$ are $2.25$ , $1.25$ and $1.50$ . Find the medium having a. highest optical density.