Class 10 Science - Chapter Light - Reflection and Refraction NCERT Solutions | You are given kerosene, turpentine and w

Welcome to the NCERT Solutions for Class 10th Science - Chapter Light - Reflection and Refraction. This page offers a step-by-step solution to the specific question from Excercise ".$ex_no." , Question 4: you are given kerosene turpentine and water in w....
Question 4

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

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    
Turpentine
oil
1.47 Ruby 1.71
Benzene 1.50 Sapphire 1.77
Crown
glass
1.52 Diamond 2.42
       

Answer

Speed of light in a medium is given by the relation for refractive index (nm). The relation 

It can conclude from the relation that light will travel the slowest in the material which has the highest refractive index and travel the fastest in the material which has the lowest refractive index. Therefore, light travels the fastest in water.

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