SELECT * FROM question_mgmt as q WHERE id=3748 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=16 AND chapterId=261 and ex_no='3' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 10th science Light - Reflection and Refraction you are given kerosene turpentine and water in w

Question:

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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