If the refractive index of the liquid medium is different than the refractive index of the piece of glass, a halo-like ring appears around the edge of the glass.This halo-like effect is called a:

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The Becke line is an optical phenomenon that occurs when light passes through materials of different refractive indices, creating a bright halo-like line around the edge of the material with the higher refractive index. This effect is used in microscopy to determine relative refractive indices of materials.

If the Refractive Index of the Liquid Medium Is Different