prove that angle of incidents is equal to angle of emergence through glass slab
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There are various ways of proving this. The most elementary way is by Huygens law( drawing wavelets and doing a bit of Geometry).
The second method is by solving Maxwell's equations and obtaining Fresnel equations and applying boundary conditions.
The third is by something that's too common in Classical mechanics. The action or Lagrangian or Hamiltonian way. From this you also get the ikonal equation.
So I have listed three ways.Look in books like Hecht or Pedrotti or Principles of Optics by Max Born and Wolf. You would get them there.
The second method is by solving Maxwell's equations and obtaining Fresnel equations and applying boundary conditions.
The third is by something that's too common in Classical mechanics. The action or Lagrangian or Hamiltonian way. From this you also get the ikonal equation.
So I have listed three ways.Look in books like Hecht or Pedrotti or Principles of Optics by Max Born and Wolf. You would get them there.
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