State Huygen's principle. On the basis of Huygen's
theory establish the relation refractive index of prism = (sin (A+Dm/2))/(sin (A/2))
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The Huygens-Fresnel principle states that every point on a wavefront is a source of wavelets. These wavelets spread out in the forward direction, at the same speed as the source wave. The new wavefront is a line tangent to all of the wavelets.
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Every point on a wavefront is a source of wavelets. These wavelets spread out in the forward direction, at the same speed as the source wave.
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