Question: Three adjacent faces (that all share a corner) of a plastic cube of index of refraction n are painted black. A clear spot at the

Three adjacent faces (that all share a corner) of a plastic cube of index of refraction n are painted black. A clear spot at the painted corner serves as a source of diverging rays when light comes through it. Show that a ray from this corner to the center of a clear face is totally reflected if n > √3.

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