Question: Three plane mirrors intersect at right angles. A beam of laser light strikes the first of them at an angle ? with respect to the

Three plane mirrors intersect at right angles. A beam of laser light strikes the first of them at an angle ? with respect to the normal (Fig. 33.39).(a) Show that when this ray is reflected off of the other two mirrors and crosses the original ray, the angle a between these two rays will be a = 180o - 26.(b) For what angle ? will the two rays be perpendicular when they cross?

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