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Homework Statement
We look at the center of one face of a solid cube of glass on a line of sight making 55° with the normal to the cube face. What is the minimum refractive index of glass for which you will see through the opposite face of the cube? (Hint: see through will be possible if the ray refracted on the first face can emerge from the opposite face)
Homework Equations
Snells law: n1sin(x1) =n2sin(x2)
Where n1 and n2 are the indices of refraction and x1 if the angle of incidence while x2 is the angle of refraction.
Case of total internal reflection:
N1sin(x1) = n2sin90
The Attempt at a Solution
I tried finding the critical angle of incidence but I got no where.. been working on this for 12 hours, i feel like I am seriously missing something! Help!