350 Image FormationQ36.28You have likely seen a Fresnel mirror for sound.The diagram represents first a side view of a bandshell. It is a concave mirror for sound, designed tochannel sound into a beam toward the audience infront of the band shell. Sections of its surface canbe kept at the right orientations as they are pushedaround inside a rectangular box to form anauditorium with good diffusion of sound fromstage to audience, with a floor plan suggested bythe second part of the diagram.FIG. Q36.28SOLUTIONS TO PROBLEMSSection 36.1Images Formed by Flat MirrorsP36.1I stand 40 cm from my bathroom mirror. I scatter light, which travels to the mirror and back to me in
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