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  4. A wave front is represented by the plane y=3-x The propagation of wave takes place at

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Q. A wave front is represented by the plane $ y=3-x $ The propagation of wave takes place at

MGIMS WardhaMGIMS Wardha 2009

Solution:

The propagation of ray takes place in perpendicular direction of wavefront. Here, $ {{m}_{1}}{{m}_{2}}=-1 $ $ {{m}_{1}}= $ slope of wave front $ =-1 $ $ {{m}_{2}}= $ slope of ray $ (-1){{m}_{2}}=-1\Rightarrow {{m}_{2}}=1 $ $ \tan \theta =1\Rightarrow \theta ={{45}^{o}} $