The empty test tube dipped in water in a beaker appears silvery when viewed from a suitable direction
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The empty test tube dipped in water in a beaker appears silvery when viewed from a suitable direction because of refraction of light Ray travelling from water (denser medium ) to air (rarer medium).
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If the gradually crushing the test tube lying in a water filled beaker, then the angle of incidence of the light which is being disrupted increases.
This angle is greater than the revolutionary angle of the glass (41 °) and The light can not enter the air inside the test tube, but it reaches the eye completely by reflecting the test tube
Because the level of the test tube looks like a silver .
If the water is filled in the test tube, The test tube does not appear bright because the critical angle for glass-water is very bigger than the revolutionary angle of the glass-air.
In this situation, complete reflection of light can not be attained.
This angle is greater than the revolutionary angle of the glass (41 °) and The light can not enter the air inside the test tube, but it reaches the eye completely by reflecting the test tube
Because the level of the test tube looks like a silver .
If the water is filled in the test tube, The test tube does not appear bright because the critical angle for glass-water is very bigger than the revolutionary angle of the glass-air.
In this situation, complete reflection of light can not be attained.
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