Optical Bench ( 1 meter long) : For accurate measurement of focal length of Lenses. Overall Length 1700 mm, Scale length 1500 mm (graduated in millimeters).Improvements have also been made in the designs of the end supports and the carriages to make the whole assembly-more stable and easier to handle. 2nd plain N P 4 riders, 2 Slow Motions, Lens Holders, pins college/ school quality General
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