Draw a ray diagram to show the appearance of a stick partially immersed in water. Explain your answer.

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Solution

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A stick partially immersed in water in a glass container appears bent or raised as shown in figure above. This happens because the rays appear to come from P’ (which is the virtual image of the tip P of the stick) due to refraction from a denser medium (water) to rarer medium (air) at the surface separating two media.

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