Q. 14

An empty test tube i

Answer :

When an empty test tube is placed slanting in water, the portion of tube within water will appear to be silvery due to total internal reflection. If the tube is partially filled with water, only the portion CE (Fig. 2) will appear silvery. The lower portion AD (Fig 2) will not be silvery since total internal reflection takes place only if there is an optically rarer medium also.

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