Optical Devices
A magnifying glass, also known as a fireglass. A simple optical instrument that can obtain enlarged virtual images. Usually composed of a convex lens, frame, and handle. When using, placing the object near the back of the lens (within the focal length) can reveal an upright magnified virtual image, which helps to distinguish details. It is commonly used to view specimens, drawings, negatives, photos, movie copies, etc. Depending on the curvature and refractive index of the glass used, there are various options for amplification, such as 10, 20, or 30 times.
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