Question:
Oil is optically denser than water, but it is less mass dense compared to water. Justify this statement by showing refraction of light through these media.
Answer:
Optical density of a material determines the ability of the material to reflect light. It is not the same as mass density of the medium, which determines the heaviness of the material. That is why petrol inspire of being less denser in terms of mass than water, it is optically more denser than water.
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