A magnifying glass is basically a convex lens which works by creating a magnified virtual image of the object behind the lens. The distance between the lens and the object must be shorter than the focal length of the lens for this to occur. Otherwise, the image will be diminished and inverted, and can be used to project images onto surfaces instead.
To maximise the magnifying power, one should hold the lens near to the eye and adjusting the lens and eye together to obtain the best possible focus.
Tan Chee Yoong
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