Fix negative-focal-length lens reflection; use ideal ray-slope thin-lens law (#102)#106

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fix/negative-focal-length-lens-reflection

Jul 10, 2026

Commits on Jul 10, 2026

Fix negative focal length lens reflecting instead of diverging (#102)

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claude
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Use ray-slope thin-lens law tan(θ_out)=tan(θ_in)−y/f, matching web engine

beneaze
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claude
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