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Why does a test tube seem silvery when put in water?

Amritha Asked:

Why does a test tube seem silvery when put in water?
Answer:

This is due to Total Internal Reflection. When an empty test tube is inserted in water, the light trying to enter the test tube undergoes total internal reflection and shines like silver.

The air bubbles trapped in a glass paper weight a;lso shines like silver due to TIR.

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