
The refractive index of oil is very close to the refractive index of glass. When the light leaves the light source and enters the environment where the oil is, it changes direction. In general, when light enters another medium from one medium, its path changes, which is called refraction of light. The reason why the glass object is not seen in the oil is the same phenomenon. The oil in the container affects the rays of light shining on the container and makes it impossible to see the glass in the container.
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