A ray of light is reflected by two parallel mirrors (1) and (2) at points A and B. The ray makes an angle of 30° with the a parallel line between the two mirrors. Calculate for (a) the angle of reflection at the point of incidence A; (b) the angle of reflection at the point of incidence B (c) the  approximate number of reflections made by the two mirrors if the distance between the two mirrors id d = 4 cm and the length L of the two mirror system is 3 meters, (d) In a real system, at each reflection, there are losses of the light energy travelling between the two mirrors. If L and d are fixed, what can be done to decrease the number of reflections on the mirrors and hence the energy lost by reflection?

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