2(c)
(i) State the relation between the critical angle and the absolute refractive index of a medium.
(ii) Which colour of light has a higher critical angle? Red light or Green light.
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(i) μ = $\frac{1}{\text{sin C}}$ where μ is the refractive index of the medium and C is the critical angle.
(ii) The critical angle of Red light is higher than that of green light.