Light refraction of a prism

[John_Galt]

Homework Statement

Given an apex angle of 60 degrees and an index of refraction of 1.6; what is the smallest angle of incidence for which a ray can enter the left face of a prism and exit the right face?

Homework Equations

The Attempt at a Solution

 

[Chi Meson]

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https://www.physicsforums.com/showthread.php?t=94379