Let the refractive index of air be η1 and the refractive index of the glass be η2
We know that the refractive index of air, η1 = ηa = 1
The figure shows some light rays reflected from a small defect in the glass toward the surface of the glass.
(a) If θc = 40.00°, what is the index of refraction of the glass?
(b) Is there any point above the glass at which the viewer would not be able to see the defect? Explain.
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