Differentiate between a wavefront and a ray.
State Huygen's principle and verify laws of reflection using suitable diagram.
State Huygens principle. Using it draw a diagram showing the details of passage of a plane wave from a denser into a rarer medium.
State Huygens' principle. How did Huygens explain the absence of the backwave ?
Use Huygens' principle to show reflection/refraction of a plane wave by (i) concave mirror, and (ii) a convex lens.
According to Huygens principle, the amplitude of secondary wavelets is
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