If the refractive indexes of several different liquids are known, the:

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The submersion method involves immersing an object in liquids of known refractive indexes and observing the visibility of the object. When the object becomes invisible or least visible, its refractive index is considered to match that of the surrounding liquid. This method can be used to estimate the refractive index of glass by submerging it in different liquids and finding the match.

If the Refractive Indexes of Several Different Liquids Are Known