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Question
An empty test tube held obliquely in a jar containing water appears shining. Why?
An empty test tube held obliquely in a jar containing water appears shining. Why?
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Solution
The correct option is B Total internal reflection
This is due to the total internal reflection of light. Rays of light travelling from water to air at the surface of the test tube, strike at an angle of incidence greater than the critical angle for water-air media. Therefore, they suffer total internal reflection and reach the eye. Thus, the surface of test tube appears shining.
This is due to the total internal reflection of light. Rays of light travelling from water to air at the surface of the test tube, strike at an angle of incidence greater than the critical angle for water-air media. Therefore, they suffer total internal reflection and reach the eye. Thus, the surface of test tube appears shining.
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