الـــــــــــــــــــــــــــــدرس
http://sciencephysique.ifrance.com/2%B0%20bac%20SM%20PC%20SVT/cours%20des%20ondes%20electrmagnetique%20pour%20site.pdf
http://sciencephysique.ifrance.com/2%B0%20bac%20SM%20PC%20SVT/cours%20des%20ondes%20electrmagnetique%20pour%20site.pdf