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A flat piece of glass covers the top of a vertical cylinder that is completely filled...

A flat piece of glass covers the top of a vertical cylinder that is completely filled with water. If a ray of light traveling in the glass is incident on the interface with the water at an angle of ?a = 36.0 ? , the ray refracted into the water makes an angle of 49.3 ? with the normal to the interface.

What is the smallest value of the incident angle ?a for which none of the ray refracts into the water?

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