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(a) Undesirable foci from an orchestra created by a concave reflector behind the platform; (b) undesirable focus created on a balcony by a concave ceiling; (c) undesirable focus created in a seating plan by a concave rear walllocked

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(a) Undesirable foci from an orchestra created by a concave reflector behind the platform; (b) undesirable focus created on a balcony by a concave ceiling; (c) undesirable focus created in a seating plan by a concave rear wall

After R. Lewcock

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