Concave and convex lenses are used to magnify small image for study purposes. In the optical world, they are used to rectify the focus power of the eye so that the image lands on the retina.
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bell in vacuum
A “bell in vacuum” apparatus is a scientific setup used to demonstrate the effects of reduced air pressure (vacuum) on sound transmission. It typically consists of a bell or sound-producing object enclosed within a sealed chamber from which air has been removed, creating a low-pressure environment. This apparatus is designed to illustrate how sound travels differently in a vacuum compared to in normal atmospheric conditions, highlighting the role of air molecules in sound propagation.
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