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What should be the value of refractive index n of a glass rod placed in air , so that the light entering through the flat surface of the rod does not cross the curved surface of the rod What should be the value of refractive index n of a glass rod placed in air , so that the light entering through the flat surface of the rod does not cross the curved surface of the rod
This is same as optical fibre. As the light enters, it should not escape even in the extreme case. So lets take i=90
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