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B:02 B 2. (25 pts) A light ray enters a right triangular glass prism normally from the left edge as shown. The prism has an index of refraction of n=1.67 . Assume air is outside of the glass prism. n i. What is the critical value dc for the angle ø so that the refracting ray exiting the right face of the prism at point A will be barely skimming along the right face of the prism, i.e. 04 = 90°? ii. To completely eliminate the refracted ray from the right face (Total Internal Reflection at point A), should one choose a right triangular prism with p larger or smaller the critical angle de calculated in part i ? iii. Now consider a reflected ray from point A. It will reach the base of the prism at point B. What is the critical value for the angle o so that the refracting ray exiting the base of the prism at point B will be barely skimming along the bottom of the prism, i.e. 0g = 90° ? [Note: the condition for part iii is different from part i.]

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