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A student puts his pencil into an empty ...

A student puts his pencil into an empty trough and observes the pencil from the position as indicated in Figure.

(i) What change will be observed in the appearance of the pencil when water is poured into the trough?
(ii) Name the phenomenon which accounts for the above stated observation.
(iii) Complete the diagram showing how the student's eye sees the pencil through water.

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