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Q 9.17 (b) What is the answer if there is no outer covering of the pipe?
Answers (1)
In the case when there is no outer layer, we apply Snell's law at the glass-air interface (when the ray is emerging out from the pipe),
The refractive angle corresponding to this is, 90 - 36.5 = 53.5.
So, from here we can see that the angle r is greater than the critical angle. So for all of the incident angles, the rays will get internally reflected. In other words, rays won't bend in air-glass interference, they would rather hit the glass-air interference and get reflected
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