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Define the term wavefront. Using Huygen's wave theory, verigy the law of reflection. |
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Answer» Solution :Wave front : Wave front is the continuous LOCUS of all such particles of the medum which are vibrating in the same PHSE. Laws of reflection on the basis of Huygne's wave theory : Let XY be the reflecting surface and AB is the incident wave and A'B' be the reflected wave front. Let, v be the speed of light Time TAKEN by the light to go from point B to B' is equal to the fo from A to A'. Hence,BB'= AA' (common) `/_AB B'=/_A A'B("each "90^(@))` `DeltaABB'=DeltaB'A'A(R.H.S)` Hence,` /_BAB'=DeltaA'B'A(C.P.C.T.)` `/_i=/_r`  Hence, angle of INCIDENCE = angle of reflection. |
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