What is the Critical Angle for the glass-air interface?

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The Critical Angle for the glass-air interface is 42 degree. This means if the ray of light in the glass medium strikes the separating surface between glass and air making an angle more than 42 degree with the normal to the point of incidence then that ray of light will undergo a total internal reflection and comes back to the glass medium.

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What is the Critical Angle for the glass-air interface?
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