Question 4
You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in the table.

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

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Solution

Using the information given in the table, the refractive index of kerosene is 1.44, that of turpentine is 1.47 and that of water is 1.33. Thus, water is having a lower refractive index and is optically rarer than kerosene and turpentine. The speed of light is inversely proportional to the refractive index. Therefore the light travels fastest in water because of its lower optical density.

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

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

Q. Question 4
You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in the table.

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

You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table.

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

You are given kerosene glycerine and water so in which of these light travels fastest and in which it bends more towards normal

Question 15
You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most?

(a) Kerosene
(b) Water
(c) Mustard oil
(d) Glycerine

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