ch 30 vocabulary
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| lens | a piece of glass(or other transparent material) that can bend parallel rays of light so that they cross,or appear to cross,at a single point.
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| converging lens | a lens that is the thickest in the middle,causing parallel rays of light to converge to a focus.
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| convex lens | middle,causing parallel rays of light to converge to a focus.
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| diverging lens | a lens that is the thinnest in the middle and that causes parallel rays of light to diverge
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| concave lens | a lens that is the thinnest in the middle and that causes parallel rays of light to diverge
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| principal axis | the line joining the centers of curature of the surfaces of a lens
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| focal point | for converging lens the point at which a beam of light parallel to the principal axis converges for a diverging lens the point from which such a beam appears to come
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| focal plane | a plane passing through either focal point of a lens that is perpendicualr to the principal axis. for a converging lens, any incident parallel beam of light converges to a point somewhere on a focal plane. for a diverging lens, such a beam
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| focal length | the distance between the center of a lens and either focal point
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| real image | an image that is formed by converging light rays and that can be displayed on a screen
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| virtual image | an image formed through reflection or refraction that can be seen by an observer but cannot be projected on a screen because light from the object does not actually come to a focus
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| ray diagram | a diagram showing rays that can drawn to determine the size and location of an image formed by a mirror or lens
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