Light is incident at an angle
α on one planer end of a transparent cylindrical rod of refractive index
n. Determine the least value of
n so that the light entering the rod does not emerge from the curved surface of the rod irrespective of the value of
α![1011573_2296a5641cb2496ca0504f9da601b55c.png](https://search-static.byjusweb.com/question-images/toppr_invalid/questions/1011573_2296a5641cb2496ca0504f9da601b55c.png)