Reflecting Prism Homework: Min Refractive Index & Ray Path

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The minimum refractive index of the prism required for light to reflect is calculated to be 1.3, using the equation nisini(theta 1) = ntsin(theta 2) with given values. For part b, the user is uncertain about the issues with the ray path depicted in the attached graph. The discussion highlights the importance of understanding the relationship between angles and refractive indices in optics. Further clarification on the ray path is needed to identify specific errors. Overall, the focus is on the principles of light reflection within a prism.
crystalplane
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Homework Statement



a)What is the minimum refractive index of the prism in order for the light to reflect?
b) What is wrong with this ray path for a reflecting prism?


Homework Equations



nisin(theta 1)= ntsin(theta 2)

The Attempt at a Solution


for part a, nt is 1, theta 2 is 90 degree, theta 1 is 50 degree,
then i got ni = 1.3
For part b, i have no idea about it..
 

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the graph is attached now...
 
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