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Calibrating instruments…
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When light behaves as a wave — interference, diffraction and polarisation.
Light stops being a ray and starts being a wave. Split a beam through Young's double slit and measure the fringe width β = λD/d, watch a single slit spread light into a diffraction pattern, cross two polaroids to test Malus's law, and count Newton's rings to find a wavelength — every fringe placed exactly where the path difference and superposition demand.
Beyond the open showcase, subscribed schools get the growing library of Wave Optics experiments — searchable, tagged by concept and difficulty, and expanding continuously.