Measure the bend, work out the glass, then thread your light through to the ring.
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How to play
A calibration ray enters the mystery glass at a known angle and exits at another. Use Snell's law to deduce its refractive index, then position and rotate optics to bend the beam into the green target ring.
Read the incidence and refraction angles off the calibration ray
Compute n = sin(incidence) / sin(refraction) and enter your value
Drag and rotate mirrors and lenses to redirect the yellow beam
Land the beam in the target ring to clear the level
Game modes
Daily puzzle, the same optics challenge for everyone today
Practice, fresh levels each time
Controls
Desktop: drag a mirror to move it; use the mouse wheel or the [ and ] keys to rotate; type your refractive-index guess
Phone & tablet: drag optics with a finger and tap the field to enter your guess
Tips & strategy
Read the calibration angles carefully, the index calculation is only as good as your measurement
A higher refractive index bends the ray more sharply; expect tighter angles
Set the beam's final approach angle first, then back up to line up the earlier bounces
What you'll learn
Lens Lab is an optics puzzle about bending light, applying refraction and Snell's law to route a beam to its target.
Skills: optics, refraction, Snell's law, light and lenses
Best for: roughly grades 9–12 (ages 14+)
For parents & teachers: a hands-on way to see how light bends through media.
About Lens Lab
Lens Lab is an optics puzzle about refraction, Snell's law and beam routing. It's an original, free browser game made in-house for PlayPendium.
A free, original browser game on PlayPendium. No download, no install.
