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

Solution

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.

Some More Questions From Acids, Bases and Salts Chapter

Briefly discuss the various theories about the nature of light.

What is the wavelength range of visible light? What is the importance of this wavelength range?

Define a ray of light and a beam light. What are the different types of beams of light?

What is an optical medium? How can we classify different media on the basis of their behaviour towards light?

What do you mean by reflection, refraction and absorption of light?

Which type of phenomenon (reflection or refraction) occurs when light falls on (i) a highly polished surface like a mirror and (ii) a transparent medium like glass or water?

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Acids, Bases And Salts

Some More Questions From Acids, Bases and Salts Chapter

Briefly discuss the various theories about the nature of light.

What is the wavelength range of visible light? What is the importance of this wavelength range?

Define a ray of light and a beam light. What are the different types of beams of light?

What is an optical medium? How can we classify different media on the basis of their behaviour towards light?

What do you mean by reflection, refraction and absorption of light?

Which type of phenomenon (reflection or refraction) occurs when light falls on (i) a highly polished surface like a mirror and (ii) a transparent medium like glass or water?

What is meant by the optical image of an object?

What are real and virtual images? Can these images be obtained on a screen? Give reasons in support of your answer.

Give three points of differences between real and virtual images.

What is a mirror? Mention the different types of mirrors commonly used.

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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