In the figure for an angle of incidence 
, at the top surface, what is the minimum refractive index needed for total internal reflection at vertical face:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Using snell's law at the air water interface
At point B for total internal reflection
……….. (i)
Now, 
……. (ii)
Putting the value of 
in equation (ii) and squaring both sides
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