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Contents Planck’s Quantum Theory of Radiation Properties of photons Video lecture on Quantum Theory Numerical Problems on Quantum Theory of Radiation. Planck’s Quantum Theory of Radiation By the end of 19th century, although Maxwell’s theory of Electromagnetic wave successfully explained the phenomena like interference, diffraction, polarization etc., it failed to explain various other phenomena like … Read more

            REFRACTION AT PLANE SURFACE The phenomenon of change in path of light as it goes from one medium to another is called refraction. Laws of refraction The incident ray, the refracted ray and the normal to the surface separating to two media at the point of incidence – all lie in one plane. Snell’s … Read more