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
.png)
a)
b)
c)
d)
, at the top surface, what is the minimum refractive index needed for total internal reflection at vertical facea)
b)
c)
d)
Question ID - 152219 | SaraNextGen Top Answer 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
a)
b)
c)
d)
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
|
a) |
|
b) |
|
c) |
|
d) |
|
1 Answer
127 votes
Answer Key / Explanation : (b) -
(b)
At point 
, by Snell’s law
At point 
, for total internal reflection 
.png)
From figure, 
Now 
From equation (ii) and (iii), 
Squaring both side and then solving, we get 
127 votes
Answer Link
127