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01 فبراير 2013

الملعقة تعمل كالمرآة، وجهها الخارجي
مرآة محدبة يعكس الصورة بوضع معتدل، ووجهها الداخلي مرآة مقعرة يعكس الصورة بوضع مقلوب.

معلومات ثقافية، معلومات علمية

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أخر المواضيع من قسم : معلومات ثقافية، معلومات علمية

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