utets13 q138

138The refractive indices of kerosene oil, turpentine oil and water are 1.44, 1.47 and 1.33 respectively. In which of these materials light, travels fastest?

Option : C
Explanation : Speed of light in a medium,

speed of light in vaccum and!l is the refractive index of respective medium. Thus, smaller the refractive index higher will be the speed of light. So, from water having least refractive index 1.33. light will travel faster

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