Question
A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water. Will the pencil appear to be bent to the same extent, if instead of water we use liquids like kerosene or turpentine?
Solution
No. Bending will be different in different liquids since velocity of light at the interfaceseparating the two media depends on the relativerefractive index of the medium. Since R.I of the threeliquids are different, the apparent depth and consequently the vertical shift of the immersed portion of the pencil would be different.
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