Physics-
General
Easy
Question
A point source S is placed at the bottom of different layers as shown in the figure. The refractive index of bottom most layer is 
. The refractive index of any other upper layer is 
where 
A ray of light with angle i slightly more than 30° starts from the source S. Total internal reflection takes place at the upper surface of a layer having equal to
- 3
- 5
- 4
- 6
The correct answer is: 4
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