Question 4:
You are given kerosene, turpentine and water. In which of these does the light
travel fastest? Use the information given in Table.
Answer:
Speed of light in a medium is given by the relation for refractive index (nm). The
relation is given as
It can be inferred 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.
It can be observed from table 10.3 that the refractive indices of kerosene, turpentine,
and water are 1.44, 1.47, and 1.33 respectively. Therefore, light travels the fastest in
water.
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