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4. Binocular, optical instrument, usually handheld, for providing a magnified stereoscopic view of distant objects, consisting of two similar telescopes, one for each eye, mounted on a single frame.
5. The first optical instruments were telescopes used for magnification of distant images, and microscopes used for magnifying very tiny images.
6. Converging Lens
—The converging lens is the type of lens that are used when the sun's rays are basically observe to the focus at one point behind the lens as the lens are basically curved from the both the ends. So, that is why the sun's rays are coming at the same point.
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