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Define a wavefront . Using Huygens principle ,verify the laws of reflection at a plane surface. |
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Answer» Solution :Definitionof wave frot The wave front may be defined as a surface of constant phase . (Alternatively : The wave front is the loci of all point that are in the same phase) ` (##DBT_SM_PHY_XII_DL_18_E03_013_S01.png" width="80%"> Let speed of the wave in the MEDIUM be.u. Let the time taken by the wave front , to advance from point B to point C is ` .TAU.` Let CE REPRESENT the reflected wave front Distance AE `- utau =BC ` ` Delta AEC and Delta ABD ` are congruent `ANGLE BAC = angle ECA ` `rArr angle i= angle r` |
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