a) Explain the construction and propagation of a spherical wavefront using
Huygens principle.
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The light waves travel with the same speed(v) in all the directions. After the time ′t′, the waves will reach all the points which are at a distance vt from S. This is the spherical wavefront XY. ... To find the new wavefront after a time Δt, we draw spheres of radius vΔt with A, B and C as centres.
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