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Snell's Window
Plate 025 Physics Poster
Plate 25 speaks for itself: “The whole sky, through a 97° hole.”
The Physics
Looking up from under water, the whole hemisphere of sky is squeezed into a circle bounded by the critical angle. Outside it you see total internal reflection of the water below.
θ_c = arcsin(1/n)
- θ_c: critical angle, °
- n: refractive index of water, dimensionless
n = 1.333: θ_c ≈ 48.6°, window 97.2°.
Sources
- E. Hecht, Optics, 5th ed., §4.7.
On the poster
Plate 025, “Snell's Window”: the pixel-art plate with its slogan “The whole sky, through a 97° hole.”, the key equation and the facts panel shown above. Pixelated Physics. Physics. Personified.
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