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RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY
Magnifying glass. Animation of a magnifying glass with varying curvature. Two magnifying glasses are shown that go through the same transformation. The upper one shows the lens in side view so that its varying convexity can be seen. At the start of the animation (when the convexity is greatest) the magnifying glass greatly magnifies the letters behind. As the lens becomes increasingly flat, so the magnification drops. When it is completely flat (in the middle of the animation) then the image is the same size as the object itself. This capacity to magnify objects makes these convex lenses useful for detailed tasks.
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