JOHNNY GREIG / SCIENCE PHOTO LIBRARY JOHNNY GREIG / SCIENCE PHOTO LIBRARY
Magnifying glass. The glass lens is polished to an exact shape to produce a clear image. It magnifies the view of an object because the shape of the lens is convex, refracting light from an object to make it appear bigger. The lens has a focal point, and the magnifying glass has to be held at the correct distance from the object to obtain a clear and focussed image.
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