Questions from Inside the chapter

Class 10
Chapter 10 Class 10 - Light - Reflection and Refraction (Term 1)

## You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table 10.3

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We know that,

Refractive index of the medium = Speed of light in air / Speed of light in the medium

Therefore,

Speed of light of the medium = Speed of light in air / Refractive index in the medium

Since Speed of light in air is always constant

Hence,

Speed of light in the medium = Constant/ Refractive index of the medium

Hence, we can say that

Lower refractive index of the medium, the higher is the speed of light.

The refractive index of

• Kerosene is 1.44
• Turpentine is 1.47
• Water is 1.33

Since the refractive index of water is the lowest among the three,

Speed of light in water would be higher than that in kerosene and turpentine.

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