Question

For an angle of incidence of 45° at the top surface of a glass slab as shown in figure, what is the maximum refractive index of glass for total internal reflection? For water u =4/3​

Answer 1

Answer:

nmax=angle of incidence/angle of refraction

4/3=sin45/total internal reflection

4/3×2=TIR

TIR=1.5

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