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ohhunt 10X42 Monocular Telescope Cheapest Wide-angle Powerful Bright Hand Focus
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Optical Testing Instruments for Workshops | Möller-Wedel | Vermont Photonics
Optical Testing Instruments for Workshops | Möller-Wedel | Vermont Photonics
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SOLVED: An astronomical telescope has an objective lens whose power is four diopter the lens is placed 30cm from the eye piece when the telescope is adjusted for minimum eye strain find
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