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 θa = 36.0 ∘, the ray refracted into the water makes an angle of 49.4 ∘ with the normal to the interface. part a what is the smallest value of the incident angle θa for which none of the ray refracts into the water?
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