Mission 2 ยท Chemical Lock
Total Internal
Reflection
Glass half-cylinder ยท nโ‚ = 1.60
๐Ÿ”ฌ
2D Mode
Animated cross-section ray tracing
๐ŸงŠ
3D Mode
Drag to rotate the glass half-cylinder
2D
nโ‚ = 1.60
Incident Angle
Incident angle i (find TIR!) 56ยฐ
Refractive Index nโ‚‚
1.3252
nโ‚‚ = 1.60 ร— sin(56ยฐ)
No TIR โ€” light refracts
Mission Briefing
1Snell's Law at critical angle
nโ‚ ยท sin(iโ‚’) = nโ‚‚ ยท sin(90ยฐ)
sin(90ยฐ) = 1
โˆด nโ‚‚ = 1.60 ร— sin(iโ‚’)
At iโ‚‚ = 90ยฐ the refracted ray grazes the surface. Since sin(90ยฐ)=1, Snell's law simplifies directly.
2Why TIR only high โ†’ low index?
3Calculate nโ‚‚
โ† Set the slider first
๐ŸŽฎGuess the liquid
nโ‚‚ computed โ€” which liquid matches?
Score: 0 / 0
4Identify the liquid
โ€”
n = โ€”
NO TIR
๐Ÿ–ฑ Drag to rotate
๐Ÿ”“
Lock Cracked!
Liquid identified.