A ray of light is incident on the left vertical face of a glass cube of refractive index 
, as shown in figure. The plane of incident is the plane of the page, and the cube is surrounded by liquid 
. What is the largest angle of incidence θ 1 for which total internal reflection occurs at the top surface?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Applying Snell's law at point A,
… . (1)
But 
… . (2)
Elimination of 
between and , we get
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