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

Maierial medium

Refractive index

Material medium

Refractive index

Air

1.0003

Crown glass

1.52

Ice

1.31

Canada Balsam

1.53

Water

1.33

Rock salt

1.54

Alcohol

1.36

Carbon disulphide

1.63

Kerosene

1.44

Dense flint glass

1.65

Fused quartz

1.46

Ruby

1.71

Turpentine oil

1.47

Sapphire

1.77

Benzene

1.50

Diamond

2.42

Noting down the refractive index of these medium, we have

For kerosene, refractive index, n = 1.44
For turpentine oil, refractive index, n = 1.47
For water, refractive index, n = 1.33

Since water has lowest refractive index, so light travels fastest in this optically rarer medium than kerosene and turpentine oil.

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