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5
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a passive device used to reflect and perhaps to focus sound waves
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6
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a panel of glass that can be seen through from one side but is a mirror on the other.
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7
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An image from which rays of reflected or refracted light appear to diverge, as from an image seen in a plane mirror.
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8
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an image which is located in the plane of convergence for the light rays that originate from a given object.
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9
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a line passing through the center of curvature of a lens or spherical mirror and parallel to the axis of symmetry
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10
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a curved mirror in which the reflective surface bulges toward the light source
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11
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a spherical reflecting surface in which its bulging side faces the source of light.
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12
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a ray which makes a small angle to the optical axis of the system, and lies close to the axis throughout the system
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13
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the incident ray, the reflected ray, and the normal to the surface of the mirror all lie in the same plane
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14
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a lens that is thicker in the center than the edges
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