Simple magnifier
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The document describes a simple magnifier composed of a single converging lens used to see a larger image of an object for the eye to see. It explains that the human eye has a variable focal length that allows it to focus at different distances, and defines angular magnification as the ratio of the angle subtended by the magnified image to the angle subtended by the original object viewed at 25 cm without magnification. As an example, it describes a magnifying glass, which uses a convex lens to produce a magnified image of an object, often mounted on a frame with a handle.
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Simple magnifier
- 1. SIMPLE MAGNIFIER Ta-06 Guerrero Ta-13 Pancho Ta-28 Ravalo
- 2. • Composed of a single converging lens • Used to see a larger image of an object for the eye to see.
- 3. The Human Eye • Has a variable focal length • Muscles in the Eye can relax for viewing from a distance or tighten for close-up viewing • 25 cm – closest distance at which the eye can focus without much strain
- 4. Angular Magnification • “the ratio of the angle subtended by the image when using the magnifier to the angle subtended by the object when viewed from 25 cm by the “unaided eye” • M=θ/θ0
- 5. Example: Magnifying Glass • Convex lens used to produce a magnified image of an object • Usually mounted on a frame with a handle
- 6. Sources • http://www.physics.pomona.edu/sixideas/opt ics/gopt5.pdf • http://en.wikipedia.org/wiki/Magnifying_glass • http://justglasssite.com/tag/magnifying-glass- 2