The figure shows some light rays reflected from a small defect in the glass toward the surface of the glass. (a) If c =

The figure shows some light rays reflected from a small defect in the glass toward the surface of the glass. 

(a) If θ_c = 40.00°, what is the index of refraction of the glass? 

(b) Is there any point above the glass at which a viewer would not be able to see the defect? Explain.

Defect 0c Air Glass