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A point source S is placed at the bottom...

A point source S is placed at the bottom of different layers as shown in figure . The refractive index of bottommost layer is `mu_(0)` . The refractive index of any other upper layer is `mu(n) = mu_(0) + (mu_(0))/(4n-18)` A ray of light with angle `i=30^(@)` starts from the source S. Total internal reflection takes place at the upper surface of layer having n equal to

A

3

B

5

C

4

D

6

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-GEOMETRICAL OPTICS-LECTURE SHEET (EXERCISE-II (LEVEL-II (ADVANCED) STRAIGHT OBJECTIVE TYPE QUESTIONS))
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