A plane wavefront is incident on a surface separating two media of refractive indices n₁ and n₂ (> n₁). With the help of a suitable diagram, explain its propagation from the rarer to denser medium. Hence, verify Snell's law.

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TextDerivation of Laws of Refraction Using Huygens PrincipleInterference of Light WavesDiffraction of Light at a Single SlitCBSE PYQ

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Two waves, each of amplitude 'a' and frequency 'ω' emanating from two coherent sources of light superpose at a point. If the phase difference between the two waves is φ, obtain an expression for the resultant intensity at that point.

TextInterference of Light WavesYoung's Double Slit Experiment

What is the effect on the interference pattern in Young's double-slit experiment when (i) the source slit is moved closer to the plane of the slits, and (ii) the separation between the two slits is increased ? Justify your answers.

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