CBSE Notes, Lectures

CBSE - Physics - Light Reflection and Refraction

Light Reflection and Refraction

Short Answer Type

Refractive index of diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5. Find out the absolute refractive index of diamond.

Absolute refractive index of a medium shows the ratio of speed of light in air to speed of light in that medium. Let us assume c is the speed of light in air, v1 is speed of light in glass and v2 is speed of light in diamond.

ndg = v1/ v2 = 1.6

Absolute refractive index of glass
= − =1.5
or,

v1 = c / 1.5

Substituting the value of v1 in equation (1) we get;

c / 1.5 v = 1.6

c / v2  = 1.6 x 1.5
=2.4
So, absolute refractive index of diamond=2.4

 

 

 

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