Question

if a glass slab of refractive index n is placed inside water then will the n in formula for shift due to glass slab be n only or it will be affected by refractive index of water?

Answer 1

All of the light incident on the interface is reflected back into the incident medium! The smallest angle of incidence at which total internal reflection occurs is called the critical angle, qc. Using Snell's law, n1 Sinqθ i = n2Sin(90°) = n2.
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