Question

The drawing shows a ray of light traveling from point *A* to point *B*, in a material that has an index of refraction *n*_{1} = 2.28. At point *B*, the light encounters a different substance whose index of refraction is *n*_{2} = 1.64. The light strikes the interface at the critical angle of θ_{c}. What is the critical angle θ_{c}?

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