How Optics Work - the basics of cameras, lenses and telescopes
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How long an interstellar journey will take
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#755 Why is a Camera Lens so Complicated?
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Why lenses can't make perfect images
18:13
Convex and Concave Lenses
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How Does a Camera Work?
47:57
Autocollimators 3: Optical Design
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How a Computer Works - from silicon to apps
57:40