- #1
sgoeke
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Homework Statement
A ray of light travels across a glass-to-liqued interface. If the indices of refraction for the liquid and glass are, respictevly 1.75 and 1.52, what is the critical angle at this interface?
Homework Equations
critical angle = inverse sin (n2/n1)
The Attempt at a Solution
i used inverse sin (1.52/1.75) and got an angle of 60.3 degrees. However, I do know that if you reverse the 1.75 and 1.52 in that equation, you get an undefined angle and the correct answer is that there is not critical angle. Why do you used 1.75/1.52?