. Practical physics. 387 its image is just behind it, out to an infinite distance, its imagemoves back only to the focal plane through F. Hence theimage must lie somewhere between F and the mirror. Theimage PQ of an object PQ is always diminished, because itlies between the converging lines PC and QC. It can belocated by the ray method (Fig. 419) exactly as in the caseof concave lenses. In fact, a convex mirror and a concave lenshave exactly the same opti-cal properties. This is be-cause each always increasesthe curvature of the incident waves by an amount - •448. Images in concave mirrors. Le
. Practical physics. 387 its image is just behind it, out to an infinite distance, its imagemoves back only to the focal plane through F. Hence theimage must lie somewhere between F and the mirror. Theimage PQ of an object PQ is always diminished, because itlies between the converging lines PC and QC. It can belocated by the ray method (Fig. 419) exactly as in the caseof concave lenses. In fact, a convex mirror and a concave lenshave exactly the same opti-cal properties. This is be-cause each always increasesthe curvature of the incident waves by an amount - •448. Images in concave mirrors. Let the images ob-tainable with a concave mirrorbe studied precisely as werethose obtainable from a convex lens. Tt will be found that exactly thesame series of images is obtained: when the object is between themirror and the principal focus, the image is virtual, enlarged, anderect; when it is at the focus the reflected waves are plane, that is,the rays from each point are a parallel bundle ; when it is between the. Pig. 420. lieal image of candle formedby a concave mirror
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
