The three laser beams shown in FIGURE 26-73 meet at a point at the back of a solid, transparent sphere.
In figure 26-73

(a) What is the index of refraction of the sphere?
(b) Is there a finite index of refraction that will make the three beams come to a focus at the center of the sphere? If your answer is yes, give the required index of refraction; if your answer is no, explain why not.

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45% 45°