A light beam from a medium of refractive index 1 is incident normally on the vertical face of the prism as illustrated in the figure. The refractive index of the prism is 1.8. Find the maximum α for which no light leaves the prism through the inclined face and if within the medium the light has a frequency of 2.8 × 1014Hz, every how many meters is the undulating movement of this wave repeated within the prism?

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