In the figure shown, for an angle of incidence 
, at the top surface, what is the minimum refractive index needed for total internal reflection at vertical face AD?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
At point P,
…… (i)
At point Q, for total internal reflection, 
From figure, 
……… .. (ii)
Now, 
…… . (iii)
From Eqs. (ii) and (iii), we get
Refractive index, 
This is the minimum value of refractive index for total internal reflection at vertical face AD.
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