Question

Take a glass vessel and pour some glycerine into vessel and next pour water up
to the brim. Take a quartz glass rod. Keep it in the vessel. Observe glass rod by
the sides of glass vessel.
i) What changes do you notice ?
ii) What could be the reasons for these changes ?

Answer 1

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• When this arrangement is viewed from side, the size of the glass rod appears increased in water (μ = 1.33) and glass rod (μ = 1.5) disappeared in glycerine (μ = 1.47) because both the glass rod and glycerine have same refractive index. When mediums have same refractive index the speed of light is same in both the medium, so no bending or refraction takes place.  

• The size of glass rod appears increased in water due to taking place of  refraction.