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 mu_0 . The refractive index of any other upper layer is mu(n)= mu_0 -(mu_0)/(4n - 18) where n = 1, 2, ...... 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 n equal to

A point source S is placed at the bottom of different layers as shown

1.	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 mu_0 . The refractive index of any other upper layer is mu(n)= mu_0 -(mu_0)/(4n - 18) where n = 1, 2, ...... 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 n equal to
Answer» 3 5 4 6 Answer :C

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