Consider a ray of light incident from air onto a slab of glass (refractive index n) of width 
, at an angle 
. The phase difference between the ray reflected by the top surface of the glass and the bottom surface is
Text Solution
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Consider the diagram, the ray 
is incident at an angle 
and gets reflected in the direction 
and refracted in the direction 
. Due to reflection from the glass medium, there is a phase change of 
.
Time taken to travel along 
From Snell's law, 
Path difference, 
As, we know 
Path difference
The right ray will take same time 
to cover 
.
Hence, phase difference,
So, net phase difference 
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