The velocity of light in a medium is 1.8 x\( { 10}^{ 8} \) m/s. For TIR to occur, what should be the limitation on the angle of incidence?

> 30 > 60 =90 data insufficient.

> 30

μ = \(\frac{c}{v}\) \(\frac{c}{v}\) = 1/\(\sin {C}\)