Asked by | 11th Mar, 2009, 05:49: PM
This is due to total internal reflection of light that is incident on the test tube.
Light travels from water to air so if the angle of incidence at the water-air interface is greater than the critical angle for the water-air interface, it will be reflected. This makes the test tube shine.
Answered by | 13th Mar, 2009, 04:01: PM
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