An interactive physics lab demonstrating refractive index and Snell's law for Class 10 NCERT Science. Choose a medium — air, water, ethanol, quartz, glass, diamond, or a custom value — and watch the ray bend in real time as the angle of incidence changes, with every angle, speed, and critical-angle value calculated live from n = c/v and n₁ sin i = n₂ sin r. Explore total internal reflection by reversing the light's direction (denser → rarer medium) and pushing past the critical angle, visualize wavefronts shrinking in a denser medium while frequency stays constant, plot a sin i vs sin r graph, compare materials side by side, and test understanding with a five-question quiz — all switchable between English and हिन्दी with light/dark display modes.
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