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Convex lenses with a magnification greater than x5 became available.
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First compound microscopes used in Europe (used 2 convex lenses to make objects look larger).Suffered badly from color distortion - an effect called 'spherical aberration'.
Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.