Answer :

When the glass rod is put in liquid than the part of the glass rod that is in glycerin will disappear as shown in figure below.


This happens because both glass rod and glycerin has almost same refractive index ( 1.47 and 1.5 ). Thus when the refractive index is same the speed of light is same in both the medium thus no bending of light takes place. Hence no refraction takes place and the glass rod disappears.


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