books the speed of light in a vacuum
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سرعة الضوء في الفراغ (Info)
تبلغُ سرعة الضّوء في الفراغ 299.792.458 متراً في الثّانية الواحدة، وتقل هذه القيمة عند مرور الضّوء بالأوساط الشفّافة، وكذلك تختلف سرعته عند المرور بوسطين مختلفين، فيتعرّض للانكسار، أو الانعكاس، وذلك بحسب طبيعة الوسط الذي يمرّ به.
