Question

For an angle of incidence of 45° at the top surface of the glass slab as shown in the figure, what is the maximum refractive index of the glass for total internal reflection?(n of water =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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