وفر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.
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عندما يسقط الشعاع الضوئي من وسط أول إلى وسط ثانٍ، يعاني هذا الشعاع تغييراً في مساره داخل الوسط الثاني؛ بسبب تغيُّر في سرعة الشعاع الضوئي بين الوسطين، وتُسمَّى هذه الظاهرة بانكسار الضوء. ويمكن معرفة الزاوية الجديدة لمسار الشعاع الضوئي داخل الوسط الثاني من خلال قانون سنِل: n1/n2 = sin α2/sin α1، ويدل كل من n1 و n2 على معامل انكسار الوسط الأول والوسط الثاني على الترتيب، ويدل كل منα1 و α2 على زاوية السقوط وزاوية الانكسار على الترتيب.
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